Marcias J Martinez

Marcias J Martinez
Clarkson University · Department of Mechanical & Aeronautical Engineering

Ph.D. Mechanical Engineering

About

86
Publications
44,389
Reads
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685
Citations
Introduction
Dr. Martinez graduated with a Bachelor of Mechanical Eng. from Carleton University in 1995. After working in industry he returned to school to continue his education. In 1997, he completed a Master degree in Mechanical Eng. from Carleton University. In 2006, he finished his Ph.D. in the area of FEA of smart material structures. In his position at Clarkson University, he continues to perform research on the development of a Holistic Structural Integrity Process for aerospace structures
Additional affiliations
August 2020 - September 2020
Clarkson University
Position
  • Professor (Associate)
Description
  • AE457- Aerospace Composite Course.
January 2016 - September 2020
Clarkson University
Position
  • Professor (Associate)
Description
  • Aircraft Design II Course
August 2015 - present
Clarkson University
Position
  • Professor (Associate)
Education
January 2000 - September 2006
Carleton University
Field of study
  • Finite Element Analysis of Piezoelectric Structures
September 1997 - November 1999
Carleton University
Field of study
  • Solidification Models of Al-Si-Cu Alloys

Publications

Publications (86)
Article
Full-text available
The present study reports on the evaluation of residual stress field formation and distribution in Central Cut Plies (CCP) specimens. Real-time measurements were performed using a distributed sensing fiber optic system based on Rayleigh Backscattering, which was successfully able to capture strain distribution inside the adhesive layer at every 0.6...
Article
Full-text available
Structural Health Monitoring (SHM) is a growing field of research, as it has the potential to simultaneously improve the reliability of structures and reduce their maintenance cost. SHM requires accurate stress and strain information, preferably for the entire structure. Unfortunately, it is often infeasible to instrument every part of the structur...
Article
This study focuses on the use of optical non-contact experimental mechanic techniques to capture the transient strain formation of a single bead manually performed vertical weld. A 300 by 300 by 6.35 mm A36 steel plate was machined with a V-Groove. Digital Image Correlation (DIC) cameras in combination with a FLIR One Pro camera were positioned in...
Article
Full-text available
The application of Strain Gauges (SG) as recommended by the ASTM standards provides accurate strain measurements in isotropic materials. However, their use in composite materials becomes more challenging due to their anisotropic nature. In this study, we hypothesized that the use of the Distributed Sensing System (DSS) and the 3D Digital Image Corr...
Article
Full-text available
Structural Health Monitoring (SHM) aims to shift aircraft maintenance from a time-based to a condition-based approach. Within all the SHM techniques, Acoustic Emission (AE) allows for the monitoring of large areas by analyzing Lamb waves propagating in plate like structures. In this study, the authors proposed a Time Reversal (TR) methodology with...
Article
Full-text available
In the spirit of advancing joining concepts as well as adoption of hybrid composites, the interface of a metallic foil and carbon fabric reinforced poly- mer matrix composite was explored experimentally and computationally. An out-of-autoclave manufacturing method, double-infusion VARTM, was successfully employed to create a hybrid composite lamina...
Article
Both elastic and elastic-plastic stress-strain response were studied for a series of part-circular and V-shaped notches in flat specimens. Both the peak strain at the notch root, and the strain distribution along the notch bisector were studied. These quantities were determined analytically using detailed finite element analysis (FEA), and it was s...
Article
Full-text available
This paper studies the effect of fatigue crack growth on the propagation characteristic of multi-frequency anti-symmetric Lamb wave modes in a C-Channel type aerospace structure through a Damage Response Factor (DRF) approach based on experimental testing with numerical verification. The approach is based on an algorithm for analyzing guided wave d...
Conference Paper
Full-text available
Remotely Piloted Aircraft Systems (RPAS) are becoming increasingly important tools to monitor and protect critical infrastructure and reduce safety risks during inspections. These aircraft are being explored as tools to inspect bridges, overpasses, and other aging transportation infrastructure. These inspections can be conducted faster, safer, and...
Conference Paper
Full-text available
In the Structural Health Monitoring (SHM) field, the Acoustic Emission (AE) technique is a passive method by which damage is localized and identified by capturing Lamb Waves (LW) signals propagating in a plate-like structure. The reconstruction of emitted signals from damage at the source location constitutes one of the main challenges faced by the...
Conference Paper
Full-text available
This paper focuses on exploring the repeatability of Structural Health Monitoring (SHM) sensors to detect fatigue cracks emanating from crack-starter notches in 0.063 inches (1.6 mm) thick, aluminium 7075-T6 panels, measuring 12 by 24 inches (304.8 by 609.6 mm) in a room temperature environment. Three panels were tested in total, where each panel h...
Article
Full-text available
Acoustic Emission (AE) monitoring can be used to detect and locate structural damage such as growing fatigue cracks. The accuracy of damage location and consequently the inference of its significance for damage assessment is dependent on the wave propagation properties in terms of wave velocity, dispersion, attenuation and wave mode conversion. The...
Article
Full-text available
This paper presents an experimental evaluation of a morphing leading edge demonstrator by investigating its morphed shape, the level of induced strains in the airfoil skin, the actuation force, and the morphing mechanism's capability to lock and transfer the applied loads. In addition, a finite element model of the demonstrator is assembled compris...
Conference Paper
Full-text available
The validity of 3D transient computer models to predict the mechanics of welds is judged by correlating predictions made by the computer model with data acquired from experiments, i.e., correlating virtual and real data. The authors suspect that by far the greatest uncertainty in the predictions from these computational models has been due to the s...
Conference Paper
Full-text available
In Acoustic Emissions (AE) Hsu-Nielsen Pencil-Lead Breaks (PLB) are used to generate sound waves enabling the characterization of acoustic wave speed in complex structures. The broadband signal of a PLB represents a repeatable emission, which can be applied at different regions of the structure, and therefore can be used to calibrate the localizati...
Conference Paper
Full-text available
This paper aims to understand the effect of fatigue crack growth on the propagation characteristic of multi-frequency anti-symmetric (A o) guided wave modes in a C-Channel type structure. A novel approach has been developed that analyses guided wave signals excited at different frequencies, in order to provide a method for damage identification alo...
Article
Full-text available
The lack of a widely-accepted test standard for characterizing the mode II fatigue disbond growth behavior of adhesively bonded interfaces is a challenge to the research community in terms of producing consistent and repeatable results. Typically, researchers apply the End Notch Flexure specimen, which is already used for static delamination studie...
Article
Full-text available
Pastel paintings are one of the most fragile types of objects of art. When handling loan requests, conservators lack scientific data to assess the risk for damage in transport, and thus for making decisions whether they can be transported. A research project was initiated in 2014 to investigate the effect of vibrations on the condition of pastel pa...
Conference Paper
Full-text available
This study focuses on the development of a source identification algorithm inspired by the SHAZAM music app. The algorithm makes use of a spectrogram analysis technique for distinguishing different Acoustic Emission (AE) events. The peaks of the spectrogram are used to obtain a constellation map generating a “fingerprint” like pattern for each acou...
Article
Full-text available
Structural health monitoring has focused on the use of computational models to capture the effect of crack-like discontinuities on the behaviour of acoustic-ultrasonic signals. However, few models have taken into account the effect of geometric complexity in combination with residual stresses generated during the fatigue crack growth process. In th...
Article
Full-text available
The in-plane and out-of-plane mechanical behaviour of both ultrasonically spot-welded and mechanically fastened joints was investigated by double-lap shear and pull-through tests, respectively. Spot-welded specimens showed comparable onset failure load and significantly higher joint stiffness compared to mechanical fasteners when carrying shear loa...
Article
Full-text available
The in-plane and out-of-plane mechanical behaviour of both ultrasonically spot-welded and mechanically fastened joints was investigated by double-lap shear and pull-through tests, respectively. Spot-welded specimens showed comparable onset failure load and significantly higher joint stiffness compared to mechanical fasteners when carrying shear loa...
Conference Paper
Full-text available
Shape sensing utilizing an inverse finite element method (iFEM) was considered for obtaining the displacement fields of two cantilever beams. Traditional iFEM techniques make use of only a single type of sensor, which can lead to errors in the strain and/or displacement distributions. This study has reduced these errors by combining data from multi...
Article
Full-text available
In this paper a one-sided, in-situ method based on the time of flight measurement of ultrasonic waves is described. The primary application of this technique is to non-destructively measure the stiffness properties of isotropic and transversely isotropic materials. The method consists of generating and receiving quasi-longitudinal and quasi-shear w...
Article
Full-text available
A Fatigue Crack Growth (FCG) model for specimens with well-characterized residual stress fields has been studied using experimental analysis and finite element (FE) modeling. The residual stress field was obtained using four point bending tests performed on 7050-T7451 aluminum alloy rectangular specimens and consecutively modeled using the FE metho...
Conference Paper
Full-text available
In this study, mode II fatigue crack growth utilizing Central Cut Plies (CCP) specimens is considered, in order to assess the durability of bonded composite repairs. Fatigue tests were performed with unidirectional carbon-epoxy specimens and adhesive film co-cured. A back-face strain technique was applied to obtain strain data using a fiber optics...
Article
Full-text available
The primary objective of this research study was to evaluate the capabilities for measuring strain of a composite UAV wing with an embedded optical fiber connected to a Rayleigh backscattering distributed sensing system. This research paper summarizes the manufacturing procedure used during the instrumentation of the composite UAV wing. In addition...
Conference Paper
Full-text available
This study focuses on understanding the effect of temperature variations and the position of the piezoelectric sensors with respect to fiber orientation angle, as it relates to acoustic emission wave velocity in composite structures. A hybrid panel consisting of Unidirectional Carbon Fiber (UDCF) combined with Unidirectional Glass Fiber (UDGF) alon...
Conference Paper
Full-text available
In this work, hybrid laminates, whose constituents are a shape memory alloy NiTi foil, carbon fabric and epoxy matrix, were manufactured using the vacuum assisted resin transfer molding process. Acid etching and sol-gel surface treatment techniques were applied on both surfaces of the NiTi foil prior to fabricating the hybrid laminates. The interfa...
Conference Paper
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In this work, the hybrid interface between metal and thermosetting polymer matrix composite was studied via experimental and numerical investigations. Hybrid laminates, whose constituents are aluminum foil, carbon fabric and epoxy matrix, were manufactured using the vacuum assisted resin transfer molding process. Chromic anodization was used to tre...
Book
Full-text available
This chapter contains a brief description of current maintenance philosophies and processes that are in use by aircraft original equipment manufacturers (OEMs) and operators/maintainers as a means of reducing maintenance cost and increasing aircraft availability, while maintaining structural integrity. A description of the different types of damage...
Chapter
This chapter contains a brief description of current maintenance philosophies and processes that are in use by aircraft original equipment manufacturers (OEMs) and operators/maintainers as a means of reducing maintenance cost and increasing aircraft availability, while maintaining structural integrity. A description of the different types of damage...
Conference Paper
Full-text available
Structural load monitoring of wind turbines is becoming increasingly important due increasing turbine size and offshore deployment. Rotor blades are key components that can be monitored by continuously measuring their deflection and thereby determining strain and loads on the blades. In this paper, a method is investigated for monitoring blade defo...
Article
Full-text available
Lamb waves are useful for detecting changes in material properties, as their propagation characteristics are sensitive to changes in the medium through which they travel. Defects and damage in materials/structures can be detected by analyzing the difference between the phase and/or group velocity amplitude and mode changes of Lamb waves' propagatio...
Conference Paper
Full-text available
Morphing technologies bare a great potential for further improvements of aircraft in terms of aerodynamic efficiency and noise reduction. A complete development process from conceptual design to manufacturing of a morphing leading edge concept was developed within the scope of the LeaTop project, CleanSky Green Regional Aircraft Integrated Technolo...
Conference Paper
Full-text available
The Acoustic Emission (AE) technique can be used to perform damage detection and localisation for structural health monitoring purposes. Implementation in aircraft structures however poses a significant challenge as its performance in terms of damage detection and localisation is not well understood when used with complex structural geometries and...
Conference Paper
Full-text available
Structural health monitoring is becoming more valuable for wind energy producers as wind farms become larger and more remote. Increasing numbers of wind turbines are being installed offshore in order to take advantage of the higher wind speeds and more consistent wind resource available over the water. High winds and waves make access to offshore w...
Article
Full-text available
A hybrid structural health monitoring (SHM) system, consisting of a piezoelectric transducer and fiber optic sensors (FOS) for generating and monitoring Lamb waves, was investigated to determine their potential for damage detection and localization in composite aerospace structures. As part of this study, the proposed hybrid SHM system, together wi...
Article
Full-text available
This review article examines the range of sensors that have been proposed for monitoring wind turbine blade loads for the purpose of active load control over the past decade. Wind turbine active load control requires sensors that are able to detect loads as they occur, in order to enable a prompt actuation of control devices. Loads may be detected...
Conference Paper
Full-text available
The present study focuses on understanding the effect of load and temperature on Acoustic Emission (AE) signal propagation in an Aluminium 2024-T3 panel. In addition, the ability of an AE system to locate damage under these operational and environmental conditions was evaluated. The work was performed in two stages. In stage one, the wave group vel...
Article
Full-text available
Lamb waves are ultrasonic guided waves that propagate between two parallel free surfaces and their use for damage detection has been widely explored and demonstrated. Damage in materials/structures can be detected by analyzing the difference between the phase/group velocity and the loss of amplitude of Lamb waves on damaged and un-damaged specimens...
Conference Paper
Full-text available
The objective of this study is to evaluate the use of correlation methods as a damage detection criterion in the application of the Time Reversal of Lamb Waves (TRLW) approach. The dispersion and attenuation characteristics of the waves are used for determining the maximum area to be inspected in a two transducers configuration. The Finite Element...
Conference Paper
Full-text available
Optical Fiber System can be divided into three categories; discrete point sensing; integrated and distributed sensing. The present study will make use of a distributed sensing system for load monitoring of thermoplastic composite panels. The distributed sensing system utilized in this research study is based on the physical principle of Rayleigh Ba...
Conference Paper
Full-text available
Acoustic Emission (AE) is recognized for its potential as a Structural Health Monitoring (SHM) technique, offering several advantages, such as passive sensing and wide area monitoring, making it particularly attractive for aerospace applications. Realistic structures, like aircraft wings for example, consist of structural elements of complex geomet...
Conference Paper
Full-text available
This work describes the use of digital image correlation (DIC) technology to measure the displacement fields of two different structural health and loads monitoring (LM) test platforms subjected to bending and torsional loads. Although digital image correlation is not necessarily a technology that would be applied to an aircraft in service, the abi...