Experimental and finite element analysis of in-plane shear properties of a carbon non-crimp fabrics at macroscopic scale

2017 ◽  
Vol 52 (2) ◽  
pp. 235-244 ◽  
Author(s):  
Samir Deghboudj ◽  
Wafia Boukhedena ◽  
Hamid Satha
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Elastic Model ◽  
Macroscopic Scale ◽  
Element Analysis ◽  
Plane Shear ◽  
Shear Properties ◽  
Bias Extension Test ◽  
Bias Extension ◽  
Composite Reinforcement

Shear deformation of composite reinforcement is the most significant and important mechanism of material characterization. So, in-plane shear properties of composite reinforcement are important parameters for determining application and use of this category of materials. The bias extension test is frequently employed to investigate the in-plane shear behavior of composites fabrics with a length equal to or greater than twice its width. In the first part of this work, bias extension tests on non-crimp fabrics have been conducted. Force and displacement were measured and registered. From obtained data, shear angles and normalized shear forces were theoretically determined. The second part was a finite element analysis of the same test based on hypo elastic model at macroscopic scale. The software ABAQUS/Explicit was used to carry out the finite element analysis in the work.

Testing of In-Plane Shear Properties under Fatigue Loading

1995 ◽  
Vol 14 (9) ◽  
pp. 965-987 ◽  
Author(s):  
Larry B. Lessard ◽  
Olivia P. Eilers ◽  
Mahmood M. Shokrieh
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Life ◽  
High Stress ◽  
Fatigue Loading ◽  
Stress Concentrations ◽  
Element Analysis ◽  
Plane Shear ◽  
Shear Properties ◽  
Notched Specimens

A two-dimensional finite element analysis is performed in order to analyze and improve the performance of the three-rail shear test specimen as prescribed by the ASTM Standard Guide for testing of in-plane shear properties of composite laminates [1]. Of main interest is the location of high-magnitude stresses in the matrix direction that affect the fatigue life of the specimen. Through finite element analysis, the optimal specimen configuration is determined by inserting slots in the positions at which there are stress concentrations. This has the effect of transferring the location of high stress away from critical areas, thus increasing the fatigue life of the specimen. The results are verified by three-rail shear tests performed for both standard un-notched and new notched specimens. The notched specimens show great improvement in both static strength and fatigue life.

Study on the Acquisition Method of Tire Rubber Parameters Based on Simple Shear Test

2016 ◽  
Vol 717 ◽  
pp. 32-37
Author(s):  
Ruo Yun Wang ◽  
Jian Yun He ◽  
Ying An ◽  
Yong Kang Hu ◽  
Xin Hua Fu ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Simple Shear ◽  
Shear Test ◽  
Elastic Model ◽  
Element Analysis ◽  
Tire Rubber ◽  
Simple Shear Test ◽  
Hyper Elastic ◽  
Acquisition Method

Tire simulation gradually becomes an important mean to ensure the quality of the tires. In order to guarantee the reliability of the analysis, the study on the method of obtaining the material parameters is also increasing. According to tire force situation of actual work, the acquisition method of tire rubber parameters based on simple shear test and its application in finite element analysis were studied in this paper. In this research, the international advanced dynamic mechanical analyzer was used to test the tire rubber, and the experimental results were processed by Yeoh hyper-elastic model. The hyper-elastic parameters and thus obtained could be used for finite element analysis of tires, and the simulation results showed that these parameters could be used to simulate the tire performance. In addition, the results could also provide certain guidance for the design and manufacture of tire.

scholarly journals Finite Element Analysis on Initial Crack Site of Porous Structure Fabricated by Electron Beam Additive Manufacturing

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7467
Author(s):  
Meng-Hsiu Tsai ◽  
Chia-Ming Yang ◽  
Yu-Xuan Hung ◽  
Chao-Yong Jheng ◽  
Yen-Ju Chen ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Electron Beam ◽  
Additive Manufacturing ◽  
Mechanical Strength ◽  
Deformation Behavior ◽  
Initial Crack ◽  
Elastic Model ◽  
Element Analysis ◽  
Strength And Deformation

Ti6Al4V specimens with porous structures can be fabricated by additive manufacturing to obtain the desired Young’s modulus. Their mechanical strength and deformation behavior can be evaluated using finite element analysis (FEA), with various models and simulation methodologies described in the existing literature. Most studies focused on the evaluation accuracy of the mechanical strength and deformation behavior using complex models. This study presents a simple elastic model for brittle specimens followed by an electron beam additive manufacturing (EBAM) process to predict the initial crack site and threshold of applied stress related to the failure of cubic unit lattice structures. Six cubic lattice specimens with different porosities were fabricated by EBAM, and compression tests were performed and compared to the FEA results. In this study, two different types of deformation behavior were observed in the specimens with low and high porosities. The adopted elastic model and the threshold of applied stress calculated via FEA showed good capabilities for predicting the initial crack sites of these specimens. The methodology presented in this study should provide a simple yet accurate method to predict the fracture initiation of porous structure parts.

scholarly journals The influence of yarn fineness and number of yarn layers on in-plane shear properties of 3-D woven fabric

2020 ◽  
Vol 29 ◽  
pp. 2633366X1989792
Author(s):  
Liuxiang Guan ◽  
Jialu Li ◽  
Ya’nan Jiao
Keyword(s):  
Image Correlation ◽  
Woven Fabric ◽  
Weft Yarn ◽  
Warp Yarn ◽  
Plane Shear ◽  
Shear Properties ◽  
Bias Extension Test ◽  
Application Potential ◽  
Large Application ◽  
Bias Extension

The 3-D layer-to-layer angle-interlock woven fabric (LLAIWF) has good deformability on a complicated contour, which offers them a large application potential in the field of aerospace. This article mainly focuses on the influence of yarn fineness and number of yarn layers on in-plane shear properties of 3-D LLAIWF during bias extension. Two methods of varying the thickness of 3-D LLAIWF were designed: changing yarn fineness and changing the number of yarn layers. The deformation mechanism of LLAIWF in bias-extension test was analyzed. The effects of two methods on in-plane shear deformation were compared and analyzed. In addition to the data processing on the experimental curve, digital image correlation analysis was conducted on the test photographs, from which shear angles in different area shear angle were measured. The mesostructure of fabric during the bias-extension test was observed. The effect of decreasing yarn layers on the mesostructure of fabric was observed by cutting fabric. The results demonstrated that the yarn fineness and the number of yarn layers play a key role in the in-plane shear properties of 3-D LLAIWF. In addition, the changing of fabric thickness causes that the deformation is asymmetrical. The effect of warp yarn fineness is similar to that of weft yarn fineness during the bias-extension test. Reducing the internal yarns of the fabric created a gap, where the yarns were reduced. This gap will affect the deformability of the fabric.

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