scholarly journals Finite Element Modeling of 3D Printed Parts With Defects

2021 ◽  
Author(s):  
Geethanjali Chandramouli
Keyword(s):  
Finite Element ◽  
3D Printing ◽  
Failure Analysis ◽  
Mechanical Characterization ◽  
Failure Strain ◽  
Progressive Failure ◽  
Experimental Result ◽  
Test Results ◽  
Progressive Failure Analysis ◽  
3D Printed

To manufacture a component, one first needs to assess its structural design performance, damage tolerance, and service experience, and validate them with pertinent test results. Finite Element (FE) modeling can predict mechanical performance, save time and cost by limiting required structural testing. 3D printing is a layer-by-layer manufacturing technology that has been widely used for rapid prototyping applications in product design and development. Recently, there has been a move towards manufacturing functional products using 3D printing, which requires materials mechanical characterization and simulation. Mechanical characterization testing results are available for 3D printed ASTM D638 tensile coupons without defects, i.e. tension along (0°) and transverse (90°) to the printing direction, and a quasiisotropic stacking sequence. In addition, tensile test results of a quasi-isotropic coupon with intentional defects are also available. In this project, FE models of the coupons are created to obtain their tensile strength, modulus, and failure strain. First ply, last ply failure and stiffness reduction iterative approach have been implemented on a 2D shell model. MSC Software is used to simulate the analyses due to its ease of use for composites using 2d shell elements. This simulation is then extended to predict strength and stiffness of a quasi-isotropic coupon with defects. The analysis is also extended to implement progressive failure analysis to predict the ultimate strength of the laminate. For coupons without defects, FE models estimated test results of stiffness and strength within 1% error, while the error for estimating failure strain is higher. For coupons with defects, the error in calculating stiffness and strength is below 8%, while it is higher for failure strain. Although the stress-strain curve from FE simulation looks similar to experimental result, it is found that progressive failure analysis is necessary for obtaining failure strain values with acceptable error percentage.

scholarly journals Finite Element Modeling of 3D Printed Parts With Defects

2021 ◽  
Author(s):  
Geethanjali Chandramouli
Keyword(s):  
Finite Element ◽  
3D Printing ◽  
Failure Analysis ◽  
Mechanical Characterization ◽  
Failure Strain ◽  
Progressive Failure ◽  
Experimental Result ◽  
Test Results ◽  
Progressive Failure Analysis ◽  
3D Printed

To manufacture a component, one first needs to assess its structural design performance, damage tolerance, and service experience, and validate them with pertinent test results. Finite Element (FE) modeling can predict mechanical performance, save time and cost by limiting required structural testing. 3D printing is a layer-by-layer manufacturing technology that has been widely used for rapid prototyping applications in product design and development. Recently, there has been a move towards manufacturing functional products using 3D printing, which requires materials mechanical characterization and simulation. Mechanical characterization testing results are available for 3D printed ASTM D638 tensile coupons without defects, i.e. tension along (0°) and transverse (90°) to the printing direction, and a quasiisotropic stacking sequence. In addition, tensile test results of a quasi-isotropic coupon with intentional defects are also available. In this project, FE models of the coupons are created to obtain their tensile strength, modulus, and failure strain. First ply, last ply failure and stiffness reduction iterative approach have been implemented on a 2D shell model. MSC Software is used to simulate the analyses due to its ease of use for composites using 2d shell elements. This simulation is then extended to predict strength and stiffness of a quasi-isotropic coupon with defects. The analysis is also extended to implement progressive failure analysis to predict the ultimate strength of the laminate. For coupons without defects, FE models estimated test results of stiffness and strength within 1% error, while the error for estimating failure strain is higher. For coupons with defects, the error in calculating stiffness and strength is below 8%, while it is higher for failure strain. Although the stress-strain curve from FE simulation looks similar to experimental result, it is found that progressive failure analysis is necessary for obtaining failure strain values with acceptable error percentage.

Thinking on the Progressive Failure Analysis of the Slope

2014 ◽  
Vol 974 ◽  
pp. 293-297
Author(s):  
Xiao Ping Wang ◽  
Xiong Xia ◽  
Kun Hu ◽  
Jin Cai Feng
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Failure Analysis ◽  
Progressive Failure ◽  
Limit Equilibrium ◽  
Equilibrium Analysis ◽  
Challenging Problem ◽  
Test Analysis ◽  
Limit Equilibrium Analysis ◽  
Progressive Failure Analysis

The progressive failure study of the slope is a challenging problem. There exist a lot of problems at present in this area, it’s necessary to do some summaries. This paper did some analysis and discussion from four aspects: limit equilibrium analysis of the slope progressive failure; test analysis of the slope progressive failure, numerical simulation of the slope progressive failure and limit equilibrium analysis on the basis of finite element, and provided some reference for slope progressive failure study.

scholarly journals Durability Modeling of Environmental Barrier Coating (EBC) Using Finite Element Based Progressive Failure Analysis

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Ali Abdul-Aziz ◽  
Frank Abdi ◽  
Ramakrishna T. Bhatt ◽  
Joseph E. Grady
Keyword(s):  
Finite Element ◽  
Failure Analysis ◽  
Progressive Failure ◽  
Computational Simulation ◽  
Ceramic Matrix Composites ◽  
Life Assessment ◽  
Environmental Barrier ◽  
Progressive Failure Analysis ◽  
Environmental Barrier Coating ◽  
Barrier Coating

The necessity for a protecting guard for the popular ceramic matrix composites (CMCs) is getting a lot of attention from engine manufacturers and aerospace companies. The CMC has a weight advantage over standard metallic materials and more performance benefits. However, these materials undergo degradation that typically includes coating interface oxidation as opposed to moisture induced matrix which is generally seen at a higher temperature. Additionally, other factors such as residual stresses, coating process related flaws, and casting conditions may influence the degradation of their mechanical properties. These durability considerations are being addressed by introducing highly specialized form of environmental barrier coating (EBC) that is being developed and explored in particular for high temperature applications greater than 1100°C. As a result, a novel computational simulation approach is presented to predict life for EBC/CMC specimen using the finite element method augmented with progressive failure analysis (PFA) that included durability, damage tracking, and material degradation model. The life assessment is carried out using both micromechanics and macromechanics properties. The macromechanics properties yielded a more conservative life for the CMC specimen as compared to that obtained from the micromechanics with fiber and matrix properties as input.

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