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Abstract
In this work a technique is proposed to use bending test in order to determine the tensile and the compressive moduli of plastic sheets as well as polymer composites. A two- component free ends beam deflected in a three point cantilever is used to determine tensile and compressive moduli. Using small deflection equations and the theory of two- component beam, tensile and compressive moduli are then determined via computer program. The beam is composed of two components; spring steel and polymeric strip of the same width. These two components are bonded together with special glue. Two different types of material sheets were tested. The results show that both materials have different tensile and compressive modulus. To verify the model, uniaxial tensile tests were also performed. Taking the values of uniaxial tensile tests as reference showed acceptable accuracy at the proposed method.
Highlights
Young’s modulus E(n) for an elastic material is ratio of the uniaxial stress applied along the direction of a unit vector n to the longitudinal strain in the direction n [1]
The principles of cantilever have been used widely to study the flexural behavior of the composite materials or to measure the bending modulus and young modulus of such materials
As it can be seen the data points are in a straight line with a linear regression value of R= 0.98, indicating the accuracy of small deflection equations
Summary
Young’s modulus E(n) for an elastic material is ratio of the uniaxial stress applied along the direction of a unit vector n to the longitudinal strain in the direction n [1]. In isotropic materials it is assumed that tensile and compressive moduli are identical. These kinds of materials may behave differently in tensile stress and compressive stress. It is necessary to study and investigate the mechanical behavior of materials in different load directions [2,3]. The principles of cantilever have been used widely to study the flexural behavior of the composite materials or to measure the bending modulus and young modulus of such materials. In most of the bending experiments, it is assumed that the tensile and the compressive moduli of the materials are the same. In anisotropic materials differences between these two moduli may be observed [4,5,6,7]
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