Abstract
For stress-strain response simulations and damage prediction of cyclically loaded mechanical components, it is crucial to determine both the stress-strain and durability curves of the materials sued. Round and flat specimens can be used for this purpose, either following standard recommendations for their geometry or by designing a special geometry which enables special requirements, such as initial cracks of various shapes, attachment of an extensometer, special grips for raised temperatures, and so on. However, especially in the case of flat specimens having a slender shape, buckling can occur before the stress or strain values reach a sufficient magnitude in compression. To avoid this, an anti-buckling support can be attached to the specimen, which prevents the occurrence of buckling. In turn, friction occurs between the specimen and the anti-buckling support, which affects the measurement of the stress. If a special sensor is attached under the anti-buckling support, the friction force can be measured and subtracted from the stress signal, leaving only the stress-strain response of the material under investigation. In this study, two materials were investigated during incremental step and variable loading tests: The aluminium alloy AlMgSi0.5 and a biodegradable polylactide.
Highlights
For a product operating under variable conditions, a variable stress-strain response is observed in every point of the product [1]
Two materials were investigated during incremental step and variable loading tests: The aluminium alloy AlMgSi0.5 and a biodegradable polylactide
The stress-strain responses are depicted in Figure 7 for the incremental step tests and in Figure 8 for the variable amplitude histories
Summary
For a product operating under variable conditions, a variable stress-strain response is observed in every point of the product [1]. If either high loads or raised temperature occur during the operation of the product, the yield strength of the material could be exceeded and a non-linear stress-strain response can be expected [1,2,3]. When the stress-strain response of a loaded product is simulated by, for example, the finite element method, or damage predictions are performed for such a product, results of uniaxial cyclic tests are usually required to determine the parameters of either the material or the damage model [4]. Modest fluctuations of the parameter values can considerably affect the stress-strain simulations and damage predictions [5]. The dissipated energy, as a measure of the damage, can be determined from the experimental results of the uniaxial cyclic tests [6]
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