Experimental Study on the Compressive Strengths of Woven Glass-Epoxy Composites

2016 ◽  
Vol 842 ◽  
pp. 31-35
Author(s):  
Bambang K. Hadi ◽  
Rahmah S. Trisolicha
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Failure Modes ◽  
Dominant Role ◽  
Tensile Tests ◽  
Epoxy Composites ◽  
Woven Composites ◽  
Band Formation ◽  
Compressive Stresses ◽  
Compressive Tests

Reliable experimental data on compressive strength of composite material are important, especially for designing structures having dominant compressive stresses, such as bolted joints. Composite materials usually have lower compressive strengths compared to tensile strengths. Woven composites added more complications. Initial waviness in woven composites makes the compressive strengths even much lower. Therefore, in this paper, experimental study on the compressive strengths of woven composites will be presented. The experiments used standard ASTM D3410M-03. Woven glass-epoxy will be tested extensively. The specimens were produced using standard hand layup techniques. Several layup configurations were tested, namely (0/90)s, (0/90/±45)s and (±45)s. The results showed that woven glass-epoxy generated failure modes specifically found in compressive tests of composites, such as: fiber micro-buckling, fiber crushing and shear band-formation. It was also found that unlike in the case of tensile tests, the layup configurations did not affect the compressive strength values. It seems that the fiber orientation will not affect significantly the compressive strengths. The epoxy matrix played more dominant role on the compressive behavior of woven glass-epoxy composites.

Experimental Study on the Mechanical Properties of Satin Carbon Fabric/Epoxy Composites

2005 ◽  
Vol 297-300 ◽  
pp. 2909-2914
Author(s):  
J.C. Liu ◽  
Tie Jun Wang ◽  
W. Zhang
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Experimental Study ◽  
Compressive Strength ◽  
Composite Laminates ◽  
Conversion Ratio ◽  
Resin Content ◽  
Epoxy Composites ◽  
Carbon Fabric ◽  
Fabric Composites

Effect of resin content on the mechanical properties of satin carbon fabric/epoxy composites is studied in this paper. Mechanical properties of the satin carbon fabric/epoxy composites are experimentally measured. The compressive strength and conversion ratio of strength of carbon fiber in the fabric composites are measured and compared with the experimental data of composite laminates reinforced by unidirectional fiber tape.

Experimental Study on Compressive Behavior of CFRP Confined Concrete Columns

2012 ◽  
Vol 446-449 ◽  
pp. 3725-3729
Author(s):  
Wei Hua Ma ◽  
Hong Zhen Kang
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Concrete Strength ◽  
Concrete Columns ◽  
Confined Concrete ◽  
Concrete Column ◽  
Compressive Behavior ◽  
Reinforcing Effect ◽  
Research Results ◽  
Compressive Tests

Compressive tests of 30 concrete column specimens with three concrete strength grades are carried out in this paper to study ultimate compressive strength of specimens. The specimens are divided into three groups, that is, unconfined, confined by CFRP with no initial compression and confined by CFRP with various initial compressions. The different initial compressions’ influence on ultimate stresses and strains are investigated. The decrease of CFRP reinforcing effect due to pre-compression are analyzed. The research results provide experimental datum for reinforced design of existing concrete columns.

scholarly journals An Experimental Study on the Basic Mechanical Properties and Compression Size Effect of Rubber Concrete with Different Substitution Rates

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Yanli Hu ◽  
Xuewei Sun ◽  
Aiqun Ma ◽  
Peiwei Gao
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Shear Strength ◽  
Size Effect ◽  
Substitution Rate ◽  
Failure Modes ◽  
Pure Shear ◽  
Specimen Size ◽  
Substitution Rates ◽  
Rubber Concrete

An experimental study was carried out on the uniaxial compression, uniaxial splitting, pure shear, and compression size effect of rubber concrete with 5 different substitution rates by applying hydraulic servo and direct shear apparatus. Then, by comparing the failure modes and ultimate strength eigenvalues of rubber concrete under different loading conditions, the following conclusions were drawn: with the increase of rubber substitution rate, the concrete specimens maintain a relatively good integrity under uniaxial compressive failure; on the contrary, the failure sections under uniaxial slitting and pure shear gradually become uneven with an increasing amount of fallen rubber particles. With the increase of specimen size, the integrity of rubber concrete after failure is gradually improved. Affected by an increased rubber substitution rate, the uniaxial compressive strength, splitting tensile strength, and shear strength of the concrete gradually decrease, while the plastic deformation capacity gradually increases. Specifically, the compressive strength is reduced by a maximum of 60.67%; the shear strength is reduced by a maximum of 49.85%; and the uniaxial splitting strength is reduced by a maximum of 58.38%. Then, we analyzed the strength relationship and the underlying mechanism among the three types of loading modes. It is found that, at the same rubber substitution rate, the compressive strength of rubber concrete gradually increases as the specimen size decreases, and the size effect on the compressive strength gradually decreases as the rubber substitution rate increases. Meanwhile, we performed qualitative and quantitative analysis on the equation describing the coupling effect of specimen size and rubber substitution rate on the compressive strength; the results suggest that the proposed equation is of a high level of applicability. Our research has a reference value for the application and promotion of rubber concrete in actual engineering projects.

Dynamic properties and strain rate effect of 3D angle-interlock carbon/epoxy woven composites

2017 ◽  
Vol 36 (20) ◽  
pp. 1531-1541 ◽  
Author(s):  
Jiuzhou Zhao ◽  
Li Zhang ◽  
Licheng Guo ◽  
Yongqi Yang
Keyword(s):  
Strain Rate ◽  
Failure Modes ◽  
Split Hopkinson Pressure Bar ◽  
Strain Rate Effect ◽  
Rate Effect ◽  
Woven Composites ◽  
Pull Out ◽  
Split Hopkinson ◽  
Plane Direction ◽  
Compressive Tests

A series of experiments on 3D angle-interlock carbon/epoxy woven composites were carried out using the split Hopkinson pressure bar and split Hopkinson tension bar. These tests were accomplished to investigate the strain rate effect of the dynamic compressive and tensile properties. The strain rate range is about 500/s to 1500/s for through-thickness compressive tests, 150/s to 600/s for in-plane compressive tests, and 600/s to 1000/s for in-plane tensile tests. The corresponding quasi-static properties are given for reference. The tested specimens were observed using optical microscope and scanning electron microscope. The main failure modes of the specimens include fiber breakage, fiber pull out and matrix crack. The compressive modulus of through-thickness direction is positively related to the strain rate. The compressive strength and modulus of in-plane direction shows a light fluctuation within the studied strain rate. It is found that the tensile strength and modulus of in-plane direction are negatively related to the strain rate.

Experimental Study on Basic Mechanical Properties of Recycled Concrete Made of Brick and Tile

2012 ◽  
Vol 166-169 ◽  
pp. 3323-3328
Author(s):  
Ling Jun Xie ◽  
Ai Liang Zhai ◽  
Chun He Wang ◽  
Chang Liang Ji ◽  
Shu Jian Chen
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Elastic Modulus ◽  
Failure Modes ◽  
Splitting Tensile Strength ◽  
Recycled Concrete ◽  
Brick And Tile

By experimental, study on the elastic modulus including the failure modes of Recycled Concrete made of Brick and Tile with the splitting tensile strength and the compressive strength, And the relational formula between the splitting tensile strength and the compressive strength was summarized from the results.

Review on the fatigue properties of 3D woven fiber/epoxy composites: testing and modelling strategies

2020 ◽  
pp. 152808372094927
Author(s):  
Zhenyu Ma ◽  
Pingze Zhang ◽  
Jianxun Zhu
Keyword(s):  
Failure Modes ◽  
Prediction Models ◽  
Woven Fabrics ◽  
Epoxy Composites ◽  
Woven Composites ◽  
Fatigue Properties ◽  
Structural Components ◽  
Geometrical Structures ◽  
Testing Method ◽  
3D Woven Fabrics

3D woven fiber/epoxy composites as structural components have attracted great attention in the industrial and civil fields due to high resistance to debonding or delamination. Structural components are often subjected to the conditions of cyclic loading, which detrimentally affect the service-life and damage tolerance. In this research, the fatigue properties of 3D woven fiber/epoxy structural composites were discussed, where 3D woven fabrics were embedded in epoxy matrix to enhance their mechanical properties. 3D woven fabrics were classified by the geometrical structures of repeat vertical and inclined units. Based on the testing method, the fatigue properties of corresponding composites have been reviewed. The influence of the internal and external parameters on the fatigue properties were investigated by using various observation methods, and the failure modes were also analyzed. The theorical prediction models were reviewed according to testing method, and future trends and challenges were discussed. The critical review can provide valuable ideas and guidance for future fatigue studies in 3D woven composites.

Experimental Study of Aggregates Size Effect on Strain, Damage and Permeability of Concrete

2017 ◽  
Vol 729 ◽  
pp. 115-121 ◽  
Author(s):  
Aurélie Fabien ◽  
Marta Choinska ◽  
Stéphanie Bonnet ◽  
Abdelhafid Khelidj
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Size Effect ◽  
Gas Permeability ◽  
Aggregate Size ◽  
The Other ◽  
Concrete Composition ◽  
Damage Indicator ◽  
Transfer Properties ◽  
Compressive Tests

Two approaches can be used to study the size effect: one based on the change in sample size, and the other based on the variation in the aggregates size. The main objective of this research was to study the second approach. We studied 6 various concrete mixes and each test was repeated three times. For each material, uniaxial cyclic compressive tests have been performed to investigate the behaviour of concrete in a partially damaged state. The specimens were submitted to three levels of loading corresponding to 30, 60 and 80% of the maximal compressive strength. The damage indicator chosen is the decrease of Young’s modulus and the tightness indicator is the gas permeability. Results show that the concrete composition and more particularly the aggregate size have an important influence on the mechanical and transfer properties of concretes.

Experimental studies on bolted glubam connections

2021 ◽  
pp. 136943322110179
Author(s):  
R.Z. Yang ◽  
Y. Xiao
Keyword(s):  
Failure Modes ◽  
Experimental Studies ◽  
Tensile Tests ◽  
Load Carrying Capacity ◽  
Test Results ◽  
Laminated Bamboo ◽  
Load Carrying ◽  
End Distance ◽  
Compressive Testing ◽  
Compressive Tests

This paper reports tensile and compressive test results of bolted glubam (glued laminated bamboo) connections. The tensile tests were carried out with two types of specimens designed for tensile loadings in the longitudinal and transverse directions in relevance to the orientations of the bidirectional bamboo strips (fibers). In each direction, the specimens were further divided into nine groups according to different combination conditions of end and edge spacings. Compressive tests were executed for three groups of bolted glubam connections, with varying thickness of the main board and bolting conditions. The tensile experiments show that the failure of the specimens is strongly influenced by the loading directions. Recommended end distance and side distance are provided, whereas the load carrying capacity is analyzed. Based on the compressive testing results, failure modes and load displacement relationships are analyzed, in which the yield bearing capacity is shown to be close to that given by the equations in existing design specifications for timber structure.

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