Scott Edward Stapleton

Scott Edward Stapleton
University of Massachusetts Lowell | UML · Department of Mechanical Engineering

Ph.D.

About

67
Publications
11,968
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
482
Citations
Additional affiliations
August 2007 - May 2012
University of Michigan
Position
  • Research Assistant
January 2004 - August 2007
University of Utah
Position
  • Research Assistant

Publications

Publications (67)
Article
Adhesives with functionally graded material properties are being considered for use in adhesively bonded joints to reduce the peel stress concentrations located near adherend discontinuities. Several practical concerns impede the actual use of such adhesives. These include increased manufacturing complications, alterations to the grading due to adh...
Article
Medical meshes are used as structural reinforcement both in clinical surgery and tissue engineering. However, complex loading conditions often found in such applications result in a non-homogenous stress distribution, for which the uniform reinforcement provided by the meshes is not optimal. This study aims to design a textile reinforcement with a...
Conference Paper
View Video Presentation: https://doi.org/10.2514/6.2022-0074.vid By taking advantage of repeating geometry found in fiber reinforced microstructures, a reduced order model was created where the only degrees of freedom exist at fiber centerlines, making for an efficient model compared to traditional continuum finite element models. The formulation o...
Conference Paper
Modeling composites can be an effective way to understand how a part will perform without requiring the destruction of costly specimens. By combining artificial fiber entanglement with manufacturing process simulation, a method was developed to create fiber bundle models using entanglement to control the fiber volume fraction. This fiber entangleme...
Conference Paper
Fiber reinforced composites are used widely for their high strength and low weight advantages in various aerospace and automotive applications. While their use may be sought after, modeling of these material requires increasing fidelity at the lower scales to capture accurate material behavior under loading. The first steps in creating statisticall...
Conference Paper
Carbon fiber reinforced plastics (CFRPs) are widely used due to their high strength to weight ratios. A common process manufacturers use to increase the strength to weight ratio is debulking. Debulking is the process of transversely compacting a dry fibrous reinforcement prior to wet out with the matrix resin, in order to induce fiber nesting, effe...
Article
Microscale computed tomography scans of fiber-reinforced composites reveal that fibers are most often not strictly parallel to each other but exhibit varying degrees of misalignment and entanglement. One characteristic of this entanglement is the degree to which fibers stay together as clusters. In this study, a method for identifying and isolating...
Article
A finite element based computational model simulating the standard drop tower test for military helmets was created and used in conjunction with a multi-output Gaussian process surrogate to seek different designs of helmets for improved blunt impact performance. Experimental drop test results were used for the validation of the model’s ability to s...
Conference Paper
Large scatter of bulk composite properties is linked to the process-induced microstructural variations during composite manufacturing. It is hypothesized that quantification and virtual reproduction of these process-induced variations in the composite microstructure can highlight the effect of processing conditions on the composite microstructure a...
Conference Paper
Grading adhesive properties across a bondline can lead to more unniform stresses and increased strength without altering the geometry of the adherends. In this research, radiation sensitizers have been added to adhesives to create a secondary cross-linking possibility that is activated with radiation. In this way the adhesive stiffness and strength...
Chapter
The demand for fiber-reinforced composites (FRCs) is rising due to a high lightweight potential. The lightweight potential arises from high stiffness-to-weight ratios in comparison with other lightweight materials such as aluminum. Despite these advantages, FRCs are often not used in lightweight construction applications because of high costs, whic...
Article
Flexible hybrid electronics (FHEs) are finding increasing applications because they overcome many of the limitations of non-deformable traditional electronic boards while still maintaining low-cost fabrication. A critical key to the performance of FHEs depends on the adhesion energy of the interface between printed conductive silver pastes and a fl...
Article
Curing of adhesive bondlines is a critical and time‐consuming operation in wind turbine blade manufacturing. Significant variation in adhesive thickness can lead to important differences in thermal histories trough the adhesive bonds due to the exothermic nature of the cure process. Reducing bondline cure cycle time and avoiding adhesive overheatin...
Article
The curing of adhesives in wind turbine blades is a cost and time-intensive manufacturing step. Bondlines are critical to the structural integrity of the blade, but substantial variation in bondline thickness can result in different thermal histories and even degradation of the adhesive due to its exothermic reaction. Models to predict the thermal...
Article
Full-text available
Braided-cord reinforced textile composites have the potential to be a material system choice that can offer comparable specific-strength and specific-stiffness properties as woven and uniaxial fabric-reinforced composites with the added benefit of higher specific-energy absorption. This increase in energy absorption is a result of tube crushing at...
Article
Despite the proliferation of high fidelity finite-element (FE) models, lower fidelity models remain commonly used in adhesively bonded joint design. These design models can save both computational and user time due to their simplicity and ease of use. This study presents a detailed assessment of local stress fields predicted by five design models:...
Article
Four dimensional (4D) textiles consist of a textile with a printed polymeric grid, where deformation of the grid is induced by introducing residual stresses in the textile, in this case through pre-stretching of the textile substrate prior to printing. The fourth dimension refers to the ability of the structure to change shape over time by changing...
Article
Full-text available
Thermoplastic fiber reinforced composites (TPFRCs) are becoming more important due to the potential of short part cycle times and recyclability. One major problem of these materials is process stability. During processing, unwanted distortions appear due to residual stresses on different scales. The prediction of these distortions and stresses woul...
Article
Full-text available
Non-crimp fabrics (NCFs) enable relatively high mechanical properties by keeping the reinforcement tows straight. Handling of those fabrics is improved by stitching the reinforcement tows together. While the stitching has little structural influence on the final part, it highly affects the NCFs capability to shear and drape over a mold during prefo...
Chapter
Tissue engineered valvular implants are in development as living and remodelling prostheses to replace damaged native valves. To improve the mechanical properties of the valve, textile is used as a reinforcing scaffold. To predict the behaviour and optimize the structure of such composites, it is necessary to understand the behaviour of the underly...
Article
Prosthetic heart valves deployed in the left heart (aortic and mitral) are subjected to harsh hemodynamical conditions. Most of the tissue engineered heart valves have been developed for the low pressure pulmonary position because of the difficulties in fabricating a mechanically strong valve, able to withstand the systemic circulation. This necess...
Article
Full-text available
The global mechanical properties of textiles such as elasticity and strength, as well as transport properties such as permeability depend strongly on the microstructure of the textile. Textiles are heterogeneous structures with highly anisotropic material properties, including local fiber orientation and local fiber volume fraction. In this paper,...
Article
In flow simulation of liquid composite molding under a flexible cover, such as vacuum infusion (VI), the accuracy can be improved by accounting for the compressibility of the reinforcement. The compressibility has been predominately measured using a universal testing machine (UTM) but discrepancies have been observed between the compressibility det...
Article
Full-text available
Automation of the preforming process brings up two opposing requirements for the used engineering fabric. On the one hand, the fabric requires a sufficient drapeability, or low shear stiffness, for forming into double-curved geometries; but on the other hand, the fabric requires a high form stability, or high shear stiffness, for automated handling...
Article
Self-healing prostheses that can replace damaged native organs, like tissue-engineered valvular implants, are under development. Engineered soft tissues can greatly benefit from reinforcements to attain mechanical properties comparable with the native organs. Complex interactions at various levels between the reinforcements and engineered tissue ma...
Article
Full-text available
Laminated paperboard and paper is widely used in packaging products. Its out-of-plane properties play a crucial role in converting paperboard to a carton through the creasing and folding process. The aim of this study is to describe the out-of-plane mechanical response with an elastic-plastic model based on the observed experimental behavior. The m...
Article
Adhesives with graded properties along the bondline are being developed to increase the strength of adhesively bonded joints. Efforts to do this in the past have resulted in mixed results. Two adhesive parameters need to be considered: the geometry of the gradation and the material properties of the adhesive at different gradation levels. In order...
Article
Full-text available
Non-crimp fabrics have become prominent in the automotive and aeronautic industry due to their economical fabrication and the high degree of drapability. The aim of this study is to demonstrate a procedure for experimental characterization and constitutive modeling of non-crimp fabrics. Accordingly , detailed experimental results of tension, bendin...
Article
Full-text available
Laminated paperboard and paper is widely used in packaging products. It generally exhibits highly anisotropic and nonlinear mechanical behavior. The aim of this study is to describe the in-plane material behavior with an orthotropic elastic-plastic model based on the observed experimental behavior. A structural tensorbased approach was applied to m...
Article
Tissue engineered heart valves equivalent to the native aortic heart valves are in development as an alternative to available prostheses. To achieve sufficient mechanical stiffness for application in tissue engineered valves exposed to the systemic circulation, the tissue is reinforced by a textile scaffold. Mechanical testing of structurally diffe...
Conference Paper
Full-text available
Laminated paperboard is widely used in packaging products. It is generally composed of several pulp fiber layers bonded to each other by starch or adhesive material, leading to macro anisotropic elastic-plastic behavior. The aim of this study is to predict the mechanical properties of a paper layer by using a three-scale approach consisting of the...
Article
Laminated paperboard is widely used in packaging products. Interface delamination plays a crucial role in converting paperboard to a carton through the creasing and folding process. Thus, the aim of this study is to experimentally and numerically investigate the interface fracture behavior in pure crack opening mode (mode I) and sliding mode (mode...
Article
The simulation of textiles often occurs at the meso scale, where the individual tows are treated as a homogeneous continuum. To properly utilize such models, fiber-scale models are required to obtain homogenized tow mechanics and consider fiber-scale mechanisms. The current study demonstrates a representative volume element (RVE) for parallel fiber...
Article
Full-text available
Transcatheter aortic valve implantation of fibrin-based tissue engineered heart valves with a tubular leaflet construct have been developed as an alternative to invasive traditional surgical heart valve implantation. In general, they are well suited for the pulmonary position, but display insufficient mechanical properties for the aortic position....
Article
Macroscopic finite elements are elements with an embedded analytical solution that can capture detailed local fields, enabling more efficient, mesh independent finite element analysis. The shape functions are determined based on the analytical model rather than prescribed. This method was applied to adhesively bonded joints to model joint behavior...
Article
Macroscopic finite elements are elements with an embedded analytical solution that can capture detailed local fields, enabling more efficient, mesh independent finite element analysis. The shape functions are determined based on the analytical model rather than prescribed. This method was applied to adhesively bonded joints to model joint behavior...
Article
Enhanced finite elements are elements with an embedded analytical solution that can capture detailed local fields, enabling more efficient mesh independent finite element analysis. In earlier research, this method was applied to adhesively bonded joints. The adherends were modeled as composite Euler–Bernoulli beams, and the adhesive layer was model...
Conference Paper
Full-text available
The influence of fiber tows on the deformation and damage evolution in fiber reinforced composites is investigated by considering a micromechanical model of fibers within matrix that is undergoing compaction and subsequently subjected to mechanical loads. The stresses developed due to compaction of the matrix during the VARTM manufacturing process...
Article
Full-text available
The paper introduces a novel clamp adapter with the goal to improve the quality of the tensile test setup for high-modulus multi-filament yarns. Common tensile test machines damage the yarns initially or prematurely due to non-uniform load introduction which causes stress concentrations. As a result, the theoretical yarn strength (perfectly clamped...
Article
Full-text available
The design and sizing of adhesively bonded joints has always been a major bottleneck in the design of composite vehicles. Dense finite element (FE) meshes are required to capture the full behavior of a joint numerically, but these dense meshes are impractical in vehicle-scale models where a course mesh is more desirable to make quick assessments an...
Article
Adhesively bonded structural components are increasingly being considered for lightweight aerospace structures. This chapter provides a state-of-the-art description of how contemporary advances in computational mechanics, based on the finite element method, can be used to obtain a basic understanding of the deformation response of adhesive joints i...
Article
Full-text available
Enhanced finite elements are elements with an embedded analytical solution that can capture detailed local fields, enabling more efficient, mesh-independent finite element analysis. In the present study, an enhanced finite element, referred to as a bonded joint element, that is capable of modeling an array of joint types is developed. The joint fie...
Article
Full-text available
Elements based on the exact stiffness matrix method contain an embedded analytical solution that can capture detailed local fields, enabling more efficient mesh independent finite element analysis. In the present study, this method was applied to adhesively bonded joints. The adherends were modeled as Euler-Bernoulli beams, and the adhesive layer w...
Article
Full-text available
Facesheet debonding and buckling failure modes are often the cause of low energy absorption in composite sandwich panels under edgewise compression loading. To control the failure mode and initial failure location, the use of structural enhancements coupled with crush initiators were investigated. Three types of structural enhancements (end bevels,...
Article
The design and sizing of adhesively bonded joints has always been a major bottleneck in the design of composite vehicles. Dense meshes are required to capture the full behavior of a joint, but these dense meshes are impractical in vehicle-scale models where a course mesh is more desirable to make quick assessments and comparisons of different joint...
Article
Macroscopic finite elements are elements with an embedded analytical solution used to carry out efficient, mesh independent finite element analysis. In the present study, this method of macro elements was applied to a single lap joint. The adherends were modeled as Euler-Bernoulli beams, and the adhesive layer assumed to be in a state of plane stre...
Article
Full-text available
To achieve high energy absorption under edgewise compression loading, sandwich composites must experience a progressive failure that includes compression failure of the facesheets. This investigation focused on sandwich core design for energy absorption through the use of failure mode maps. Predictive models for global buckling, facesheet wrinkling...
Article
Full-text available
Sandwich composites loaded in edgewise compression often display low energy absorbing failures due to facesheet debonding and/or buckling-type failure modes. Although crush initiators have been used to trigger progressive crushing in monolithic composites, little research has been performed to investigate the use of crush initiators with sandwich c...

Network

Cited By

Projects

Project (1)
Project
Modeling the anisotropic elastic-plastic material model of paperboard and the interfaces between paperboard sheets