Markus Günter Ronny Sause

Markus Günter Ronny Sause
Universität Augsburg | UNA · Institute for Material Resource Management

Prof. Dr. habil.

About

182
Publications
46,771
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Introduction
At the group Mechanical Engineering at the Institute of Materials Resource Management we develop and use a multitude of testing methods. The focus of our research are fiber reinforced materials, but other materials such as hybrids (sandwich materials, fiber-metal laminates) are investigated as well. Moreover, all testing methods are applied to conventional materials, such as metals, ceramics and polymers. Within the field of numerical modeling our focus is on the modeling of materials with distinct hierarchical organization. Our development includes multi-scale and multi-pysics approaches as well as homogenization strategies. To reach improved reliability of models for damage progression and dynamical phenomena such approaches are key.
Additional affiliations
September 2016 - present
Universität Augsburg
Position
  • Professor
April 2012 - present
Universität Augsburg
Position
  • Lecturer
Description
  • Characterization of Composite Materials (lecture series) Nondestructive Testing (lecture series) Finite element modeling of multiphysics phenomena (method course)
August 2011 - September 2016
Universität Augsburg
Position
  • Head of Department
Education
August 2007 - December 2010
Universität Augsburg
Field of study
  • Experimental Physics, Materials Science and Engineering
October 2002 - August 2007
Universität Augsburg
Field of study
  • Physics

Publications

Publications (182)
Conference Paper
Full-text available
Eine in den Prozess integrierte Qualitätsüberwachung bietet einen maßgeblichen Vorteil für nachhaltige und effiziente Fertigungsverfahren, wovon gerade komplexe Fertigungsprozesse zur Verarbeitung hochpreisiger oder aufwändig hergestellter Materialien profitieren. Ein derartiges Überwachungssystem wurde am Beispiel eines T-RTM Prozesses zur Herstel...
Chapter
Full-text available
Acoustic emission (AE) is one of the most promising methods for structural health monitoring (SHM) of materials and structures. Because of its passive and non-invasive nature, it can be used during the operation of a structure and supply information that cannot be collected in real time through other techniques. It is based on the recording and stu...
Chapter
Full-text available
Based on the variety of methods available for gathering data for the aircraft health status, the challenge is to reduce the overall amount of data in a trackable and safe manner to ensure that the remaining data are characteristic of the current aircraft status. This chapter will cover available data reduction strategies for this task and discuss t...
Chapter
Polymeric composites comprise a wide range of materials consisting of continuous or discontinuous fibers, various particles, or combinations of these embedded in a polymer matrix. Beside technical polymer composites, bio-based composites with biopolymers or natural fibers, or natural polymer composites such as wood are finding increasing use in str...
Chapter
Machining of fiber reinforced composites remains a challenging process at the end of the value chain. Malfunctions of machinery and bad surface quality cause a tremendous loss of value and need to be reduced to increase competitiveness in lightweight applications. Monitoring of machining steps can be carried out by many different techniques and str...
Article
The mechanical integrity of the sealant material is of key importance for the long-term, reliable operation of solid oxide fuel/electrolysis cell stacks. However, in-situ monitoring and detection of potential failures in sealing materials using classical electrochemical characterization techniques are difficult tasks. Therefore, in this work, the a...
Article
Full-text available
The limited capability to predict material failure in composite materials and specifically in wavy composite layers has led to high margins of safety for the design of composite structures. Thus, the full lightweight potential of this class of materials is left unused. To understand the complex failure behavior of composite materials containing out...
Book
Full-text available
This open access book presents established methods of structural health monitoring (SHM) and discusses their technological merit in the current aerospace environment. While the aerospace industry aims for weight reduction to improve fuel efficiency, reduce environmental impact, and to decrease maintenance time and operating costs, aircraft structur...
Conference Paper
Full-text available
Fiber waviness in composite materials, also referred to as wrinkles, can be considered as one of the most significant manufacturing effects. The severe knockdown of mechanical properties, such as stiffness, strength and fatigue leads to a dramatically reduced load carrying capacity of the material. Wavy plies can appear in arbitrary shapes and loca...
Conference Paper
Full-text available
Out-of-plane fiber waviness, also referred to as wrinkling, is considered one of the most significant effects that occur in composite materials. It significantly affects mechanical properties, such as stiffness, strength and fatigue and, therefore, dramatically reduces the load carrying capacity of the material. Fiber waviness is inherent to variou...
Article
Full-text available
Out-of-plane fiber waviness, also referred to as wrinkling, is considered one of the most significant effects that occur in composite materials. It significantly affects mechanical properties, such as stiffness, strength and fatigue and; therefore, dramatically reduces the load-carrying capacity of the material. Fiber waviness is inherent to variou...
Presentation
Full-text available
Out-of-plane fiber waviness is a common effect inherent to various manufacturing processes of fiber-reinforced composite parts. They cannot be completely avoided and therefore have to be tolerated and be considered as an inherent part of the structure. To this point, there is still no acceptable approach in aircraft industry to quantitatively suppo...
Preprint
Full-text available
Components made from carbon fiber reinforced plastics (CFRP) offer attractive stability properties for the automotive or aerospace industry despite their light weight. To automate CFRP production, resin transfer molding (RTM) based on thermoset plastics is commonly applied. However, this manufacturing process has its shortcomings in quality and cos...
Article
Full-text available
In this paper, acoustic emission (AE) signals obtained during quasi-static crack propagation in adhesively bonded beech wood were classified using an unsupervised pattern recognition method. Two ductile one-component polyurethane (1C-PUR) adhesives with the same formulation except for one system being reinforced with short polyamide (~ 1 mm long) f...
Conference Paper
Full-text available
Modern timber constructions require high performance adhesives satisfying the various demands with respect to mechanical and physical loads. In order to develop such adhesives, a deep knowledge of the fracture behavior of the bonded wood joints and, more specifically, of the influence of the adhesive is needed. In order to better understand these p...
Conference Paper
Full-text available
The currently limited capability to predict material failure in composite materials in general and in wavy composite layers specifically has led to high margins of safety for the design of composite structures. Thus, the full lightweight potential of this class of materials is left unused. To understand the complex failure behaviour of composite ma...
Article
Full-text available
Damage initiation and progression in precipitate hardened alloys are typically linked to the failure of second phase particles that result from the precipitation process. These particles have been shown to be stress concentrators and crack starters as a result of both particle debonding and fracture. In this investigation, a precipitate hardened al...
Article
Combination of material testing methods such as X-ray computed tomography with in-situ load stages allows for detailed analysis of damage formation and progression in fibre-reinforced composites. X-ray computed tomography is highly suited to volumetrically analyse the damage evolution induced by the load stage for tensile testing after subsequent l...
Article
Digital Image Correlation (DIC) has become more and more important in the field of material characterization and research, especially for strongly anisotropic fiber reinforced materials. Its big advantage over the conventional methods like strain gauges or point based video-extensometers is the full field strain and displacement measurement and the...
Conference Paper
Full-text available
Im Rahmen des Themas Industrie 4.0 wächst die Bedeutung der automatisierten Zustandsüberwachung von Industrieanlagen. Globale Überwachungsmethoden wie schwingungsbasierte Methoden liefern eine Aussage über die Grundsteifigkeit der Anlage und können eine globale Aussage über die Funktionstauglichkeit treffen. Akustische Methoden wie die Körperschall...
Conference Paper
Full-text available
Im Rahmen des Themas Industrie 4.0 wächst die Bedeutung der automatisierten Zustandsüberwachung von Industrieanlagen. Der Einsatz von geführten Wellen bietet dafür bereits grundlegende Möglichkeiten, Schäden in Strukturbauteilen a posteriori nachzuweisen und zu quantifizieren. Die Schallemissionsanalyse erlaubt hingegen die Detektion von Mikrorisse...
Article
An acoustic emission based method to predict the local stress exposure of a fiber-reinforced material is proposed. This approach uses a step-wise increased load profile as common in testing procedures of fiber-reinforced pressure vessels. An artificial neural network is applied to establish a relationship between acoustic emission criteria evaluate...
Article
Full-text available
The meso-scale morphology of fiber-reinforced polymer-matrix (FRP) composites with fiber plies induces a range of microscopic damage mechanisms when FRP materials are subject to mechanical or thermo-mechanical loading. Both, for improving the damage resistance of FRP composites and for structural design guidelines, understanding the different damag...
Article
Ultrasonic guided waves have been used successfully in structural health monitoring (SHM) systems to detect damage in isotropic and composite materials with simple and complex geometry. A limitation of current research is given by a lack of freely available benchmark measurements to comparatively evaluate existing methods. This paper introduces the...
Article
Guided waves are used for the non-destructive evaluation in automotive and aerospace industries. There is a trend leaning away from isotropic materials to the manufacturing based on composites. However, the elastic wave dynamics in such materials is considerably more complicated. Much effort has been committed to the calculation of guided waves dis...
Article
In the design and quality control of fiber-reinforced structures, testing on coupon level and structure level are frequently carried out. In order to accept or reject a final product or material charge, means of quality control are carried out. In safety relevant structures, this is often based on holding a certain proof load. Acoustic emission is...
Conference Paper
Full-text available
Four different diamond-like carbon (DLC) coating variants were investigated via different experimental techniques to assess their suitability as adhesion promoting interlayers in intrinsic steel/epoxy-based CFRP hybrid laminates. Sandwich specimens with a symmetrical layup consisting of unidirectional CFRP with a thin, surface modified steel layer...
Article
Full-text available
In testing of structural components by the acoustic emission method, the requirement arises for quantitative prediction of the probability of detection (PoD) of an acoustic emission signal. Motivated similar as for other nondestructive testing methods, the suitability of given experimental settings to reach a certain likelihood of not missing relev...
Article
Within recent years, several alternative approaches to acoustic emission sensor calibration have been proposed. As some of these approaches make use of new geometries and materials, the aspect of absolute calibration in the context of these proposals is evaluated in this contribution. Validated numerical methods are applied to compare the expected...
Chapter
This chapter introduces the use of acoustic emission (AE) methods to detect the occurrence of damage in composite materials during loading. The description and modeling of typical source mechanisms, such as cracks of various types and friction are provided. The AE source radiation pattern and the depth through the thickness are discussed in their i...
Conference Paper
Full-text available
This contribution provides insight to some methods that provide an experimental data basis for modeling of material constituents on microscopic scale and their interaction. This covers the use of versatile full-field methods to improve the cross-validation, to obtain fiber dispersion, topology and orientation, the use of micromechanical techniques...
Chapter
This chapter describes the preparation of two types of unidirectional carbon fiber reinforced polymer green bodies, using carbon fibers with high and low chemical surface functionality embedded in a phenolic resin matrix. The fiber-matrix adhesion in these green-body composites was examined applying cyclic single fiber push-out measurements in an e...
Article
This paper presents a method for embedding realistic defect geometries of a fiber reinforced material in a finite element modeling environment in order to simulate active ultrasonic inspection. When ultrasonic inspection is used experimentally to investigate the presence of defects in composite materials, the microscopic defect geometry may cause s...
Conference Paper
Full-text available
In vielen Anwendungsbereichen der Schallemission kann es bei der Prüfung zu einer nachhaltigen Veränderung der Sensorcharakteristik kommen. Dies kann durch mechanische Beschädigung, thermische Belastung oder Verwendung unter aggressiven Umweltbedingungen geschehen. Unabhängig von visuell prüfbaren Beschädigungen der Sensoren kann es dabei zu einer...
Article
Full-text available
Electromagnetic emission (EME) generated by fracture of carbon fibre reinforced polymers (CFRP) is studied. The fracture is induced to cross-ply CFRP by mechanical loading in a three-point bending configuration. An EME acquisition set-up operating on the principle of capacitive coupling is used to measure the low frequency (kHz-MHz range) electric...
Article
Contact development between the surfaces of two tapes is considered as a critical step in processing carbon fiber reinforced thermoplastic composites. In this study, the development of intimate contact between carbon fiber reinforced Polyamide-6 (PA-6) tapes is investigated experimentally using consolidation experiments and X-ray computed tomograph...
Article
Full-text available
Electromagnetic emission (EME) signals generated by tensile fracture of four different types of polymers and three different carbon fibre types are presented and discussed. A suitable set-up for the detection of the electric field component of EME generated by fracture of solids is proposed. Basic theoretical considerations are made about the coupl...
Conference Paper
Full-text available
Within the last decades many approaches have been proposed to perform source identification in fibre reinforced composites. Some of them have been validated using skilled micromechanical experiments or by using reference specimens in combination with imaging methods, leaving strong evidence that these approaches are valid tools to perform source id...
Conference Paper
Full-text available
In addition to acoustic emission (AE), fracture of solid materials is often accompanied by electromagnetic emission (EME). These electromagnetic fields arise due to the separation, displacement or movement of charges and their temporal characteristics and spatial distributions are closely connected to the dynamics of the fracture processes and the...
Conference Paper
Full-text available
Planar hybrid laminates were investigated to quantify mode I, mode II and mixed-mode fracture toughness. These laminates were fabricated with a symmetrical layup consisting of unidirectional CFRP with a comparatively thin, surface treated steel foil in the center plane. A variety of surface treatments was applied to the steel surfaces, including sa...
Conference Paper
The fiber-matrix interaction is one of the key parameters to optimize the mechanical performance of fiber reinforced polymers. For this purpose, a sufficiently strong adhesion between fiber and matrix is necessary. This can be accomplished by employing a suitable polymeric sizing. Since conventional sizing agents, designed for thermoset composites,...
Conference Paper
Full-text available
Failure of fibre reinforced composites is a process that starts on the microscopic scale, that undergoes growth in size until reaching a structurally relevant extent on the macroscopic scale. Due to the complexity of the fibre architecture seen in today's composites the initiation and evolution of such damage is a complex procedure. In mechanical t...
Conference Paper
Full-text available
The objective of this study is to examine the differences in failure modes of carbon composite materials with a thermoset epoxy matrix in comparison to a thermoplastic PA6 matrix. The complex crack propagation and evolution will be described and compared. Also the influence of the matrix material on the fracture behaviour will be discussed. The fra...
Chapter
Originating from the field of geophysics science, electromagnetic emission analysis is a nondestructive measurement technique to monitor crack formation and propagation. Similar to acoustic emission analysis, the electromagnetic emission method is capable of providing real-time information on microscopic failure mechanisms on a qualitative basis. I...
Chapter
The intent of this chapter is to demonstrate the synergetic effects that arise by suitable combinations of the in situ methods reviewed intensively in chaps. 3–6 as well as some additional methods not extensively discussed in the previous chapters. Still the main focus is on the application to in situ detection of failure mechanisms occurring in fi...
Chapter
Generally, we start to refer to failure of a material, when the material no longer fulfills its intended use. In the context of this book the term “failure” always refers to the structural failure of the material due to mechanical load. The primary source for this failure are cracks forming within a material causing it to reduce its effective cross...
Chapter
In order to detect the occurrence of failure in a material, visual observation is a very intuitive approach. Although global failure is many times easier to observe visually, more dedicated analysis is required to detect small changes indicating the occurrence of first failure. One specific type of visual observation follows the idea to track and m...
Chapter
Acoustic emission analysis is about the detection and interpretation of ultrasonic waves caused by rapid internal displacements. In the context used herein the formation and propagation of cracks in fiber reinforced materials is understood as most relevant acoustic emission source. During propagation of the emitted acoustic wave, the characteristic...
Chapter
The method of X-ray based computed tomography is understood as a computer-aided tomographic process involving X-rays to produce three-dimensional representations of the scanned object both externally and internally. This inspection method has been substantially improved since its technological beginnings and allows inspecting fiber reinforced compo...
Conference Paper
Full-text available
Fiber reinforced polymeric materials are used for lightweight constructions and are an integral part of cars, airplanes or rotor blades of wind turbines. Non-destructive testing (NDT) methods play an increasing role concerning the manufacturing process and the inspection during lifetime. The selection of the best
Conference Paper
Full-text available
Within the frame of the publicly co-financed " MAIzfp " project, a highly promising ultrasonic data acquisition technique, termed Full Matrix Capture (FMC), is used in this paper to detect real defects in carbon fiber-reinforced plastics (CFRP) (i.e. impact damages). With this approach, a full raw data set of time domain signals (A-Scans) from ever...
Conference Paper
Full-text available
In January 2012, the cluster MAI Carbon was nominated as the Leading-Edge Cluster during the cluster competition of the Federal Ministry of Education and Research in Germany. MAI Carbon is made up of companies, training and research facilities active within the field of carbon-fibre reinforced plastics in the region of Munich-Augsburg-Ingolstadt (M...
Conference Paper
Full-text available
The digitization of NDT methods and ever increasing processing power nowadays enable the efficient combination of two or more NDT techniques in order to reach higher sensitivity and selectivity compared to a single method. Especially the combination of imaging with non-imaging methods can provide additional benefits such as improved defect localiza...
Article
Full-text available
The formation of air emboli in the xylem during drought is one of the key processes leading to plant mortality due to loss in hydraulic conductivity, and strongly fuels the interest in quantifying vulnerability to cavitation. The acoustic emission (AE) technique can be used to measure hydraulic conductivity losses and construct vulnerability curves...