The Accuracy of Characteristic Length Method on Failure Prediction of Composite Pinned Joints (original) (raw)

Experimental and numerical failure analysis of pinned-joints in composite materials

Composite Structures, 2009

In this paper, failure load and failure mode of woven glass epoxy composite plates with one and two serial pinned joints are analyzed experimentally and numerically. Two variables are investigated during analyses; the distance from the free edge of the plate to the diameter of the first-hole (E/D) ratio, and the width of the specimen to the diameter of the holes (W/D) ratios. Experiments are carried out according to the ASTM D 953 1. Numerical study is performed by means of ANSYS finite element analysis program. Yamada Sun failure criterion is used for failure analyses. Mechanical properties of the composite material are obtained from the ASTM standards. The results showed that maximum failure load is obtained at E/D=4 and W/D=4. A good agreement is found between experimental results and numerical predictions.

Failure analysis of serial pinned joints in composite materials

2011

In this paper, failure load and failure mode of woven glass epoxy composite plates with one and two serial pinned joints are analyzed experimentally and numerically. Two variables are investigated during analyses; the distance from the free edge of the plate to the diameter of the first-hole (E/D) ratio, and the width of the specimen to the diameter of the holes (W/D) ratios. Experiments are carried out according to the ASTM D 953 1. Numerical study is performed by means of ANSYS finite element analysis program. Yamada Sun failure criterion is used for failure analyses. Mechanical properties of the composite material are obtained from the ASTM standards. The results showed that maximum failure load is obtained at E/D=4 and W/D=4. A good agreement is found between experimental results and numerical predictions.

The study of different parameters on the failure of pin joints prepared from composite laminates

2020

The aim of this paper is to study the various parameters investigated by researchers to analyze the failure load of the composite laminates. They studied the various parameters like fibers used to make composites, orientation of fibers and number of laminates. The further study has been extended on the joining of the composite laminates. Th most common method of joining of two plates is with the help of pin/bolt joint. The same approach can be used to study the effect of joints in the composite laminates. To optimize the various parameters discussed are to be optimized which can be done with the help of design of experiment. The same approach, parameters and failure methods can be used to investigate the failure load of the composite laminate with multi pin joints.

Failure analysis of composite bolted joints by an experimental and a numerical approach

2018

Composite materials are widely used by aircraft manufacturers because of their high mechanical properties. These properties severely decrease when composite material are drilled and bolted. To avoid structural failure, the behavior of composite bolted joints has to be understood and mastered. An experimental database was constituted by Dassault Aviation with supported single-shear tests with countersunk head screws on different composite materials. This database is analysed to find the main parameters that lead to the failure of the joint. The end distance is the most important parameter. It has a strong influence on both the bearing stress at failure and the failure mode. Width and lay-up have a lower effect on joint failure. A two-dimensional finite element (FEM) model with elastic membrane behavior is then developed to simulate the different configurations in the database. Fiber failure criteria is computed and the dispersion of the results for each failure mode is compared to th...

Investigation of Failure Criteria and Experimental Process of the Composite Specimen with Mechanical Joints under Tensile Loading

Journal of Modern Materials, 2020

Generally, composite materials are used to obtain better engineering properties, including higher hardness, greater strength, lower weight, heat resistance, moisture and corrosion, which are not present in homogeneous materials such as metals, which are more commonly used in composite design. In this article, experimental study of the composite specimen with mechanical joints under tensile loading, joints of composite material structures, failure criteria in composite materials, tensile impact test is investigated. The results of research work it shows that maximum strength, the hand lay-up can be designed with [0º, 45º, 90º,-45º] s and layers with 45º fibers is very important, because these fibers in these layers have a significant role in increasing the resistance of the piecework under shear stresses due to the passage of stress lines along the hole; In other words, the maximum cut occurs at a 45º angle, and these layers resist this shear stress.

Failure of laminated composite pinned connections /

In thit'l investigation the behavior of pin-loaded composite plates is studied ana-Iytically. A progressive damage model is presented which is capable of predicting the three different mechanisms of fltilure: bearing, shearout, and net tension. The model consists of three major parts: stress analysis, failure analysis, and material property degradation rules. Based on the model a computer code is developed. The computer code is capable of assessing damage, evaluating residual strength, and predicting ultimate strength of pin-Ioaded composite plates. Predicted results are compared with d.vailable exp erimental data. Excellent agreement between the predicted and the experimental data was found.

A comparative study of failure criteria applied to composite materials

International Journal for Simulation and Multidisciplinary Design Optimization, 2008

This article presents an analytical and numerical investigation of the failure loads, successive failures and failure modes of laminated beams. Two simulations were developed to model various composites behaviours under transverse static loading. Progressive failure analysis has been carried out in linear and elastic range. For the two simulations, the first order shear deformation theory with shear correction factor and the finite element method have been used respectively. The main objective of this paper is to evaluate the overall damage and successive failure for different laminates obtained by failure criteria and then to conduct a comparative study of the commonly used failure criteria. Various failure criteria have been studied to predict the load, when the weakest lamina fails under flexural bending test. After the failure of the weakest ply, the stiffness is reduced to account for fibre or matrix failures. The failure criteria are tested with various stiffness reduction models. Comparisons are made between the failure loads, successive failures, failure modes, macroscopic curves and the total behaviour curves obtained by the various failure criteria used.