Effect of a Post-Fatigue Damage on the Residual Dynamic Behavior of Advanced-SMC Composites
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Effect of a Post-Fatigue Damage on the Residual Dynamic Behavior of Advanced-SMC Composites M. Shirinbayan 1 & J. Fitoussi 1 & F. Meraghni 2 & S. Farzaneh 3 & B. Surowiec 4 & A. Tcharkhtchi 1 Received: 29 April 2019 / Accepted: 23 July 2019/ # Springer Nature B.V. 2019
Abstract The purpose of this article is to investigate the effect of an initial pre-damage induced by a fatigue loading on the tensile dynamic behavior of Advanced Sheet Molding Compounds (ASMC). Tension-tension fatigue preloading at a frequency of 30 Hz is performed at various applied stress levels prior to subject the A-SMC specimens to tensile tests at different strain rates, namely: 10−3 s−1 (quasi-static), 1 s−1 and 60 s−1. The developed experimental approach provided significant findings in terms of residual behavior and damage accumulation in relation to the applied pre-fatigue loading conditions. Indeed, it has been shown that the overall quasi-static and the dynamic responses are strongly affected by the level of fatigue number of cycles reached prior to applying the high strain loading. The effect of fatigue predamage is found also strongly strain-rate dependent. Experimental results showed that the damage threshold in terms of stress and strain increased with strain rate. However, for a given strain-rate the damage stress threshold depends on the number of cycles applied during the fatigue preloading. Keywords Fatigue . Pre-damage . Dynamic . Residual behavior
* M. Shirinbayan [email protected] J. Fitoussi [email protected] F. Meraghni [email protected] S. Farzaneh [email protected] B. Surowiec [email protected] A. Tcharkhtchi [email protected] Extended author information available on the last page of the article
Applied Composite Materials
1 Introduction In order to protect automobile passengers from injury during a crash, car crash experiments should be performed to simulate the actual accident [1–5]. To obey this matter an optimum combination of body structure with material and also an exact evaluation of fatigue behavior and dynamic response of the constitutive material is highly required [4, 5]. In fact, one can note that basically, the automotive component is not always at an undamaged state. Indeed, in many applications, especially the automotive structural components, constitutive materials are subjected to vibration or oscillation forces [6–9] inducing a fatigue pre-damage accumulation prior to undergo the service loading. Thus, for a precise prediction of the dynamic response and the related energy absorption, the study of the material behavior exhibiting a fatigue pre-damage by performing fatigue tests prior high strain rate loading is of high importance. An understanding of fatigue behavior is important for any material that experiences repeated loading during service [6–9]. Fatigue response of composites is usually characterized by an S-N curve, also known as a Wöhler curve [5, 6]. It can be presented as a curve giving the value of cyclic stress amplitude, σm
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