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Multi‐scale analysis of short glass fiber‐reinforced polypropylene under monotonic and fatigue loading
Polymer Composites ( IF 4.8 ) Pub Date : 2020-08-25 , DOI: 10.1002/pc.25740 Mohamed A. Imaddahen 1, 2 , Mohammadali Shirinbayan 1 , Houssem Ayari 1 , Mathieu Foucard 2 , Abbas Tcharkhtchi 1 , Joseph Fitoussi 1
Polymer Composites ( IF 4.8 ) Pub Date : 2020-08-25 , DOI: 10.1002/pc.25740 Mohamed A. Imaddahen 1, 2 , Mohammadali Shirinbayan 1 , Houssem Ayari 1 , Mathieu Foucard 2 , Abbas Tcharkhtchi 1 , Joseph Fitoussi 1
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Short fiber‐reinforced polypropylene is largely used in the automotive industry. Fatigue failure is one of the most failure modes observed in this class of materials. In order to better understand the damage mechanisms and plasticity evolution, this article provides an overall experimental investigation of the mechanical properties of a PPGF40 composite (polypropylene matrix reinforced by a 40% weight content of short glass fibers) including monotonic and cyclic loading. The effect of various parameters such as the loading direction, the strain rate, the temperature, and the fatigue are analyzed. The evolutions of the loss of stiffness and plastic strain during monotonic and fatigue tests are analyzed. Self‐heating during cyclic loading is also studied. Moreover, the coupling effect of damage and plasticity is analyzed by plotting the evolution of the relative loss of stiffness vs the plastic strain increment for monotonic and cyclic loadings. For quasi‐static loading, the results emphasize an intrinsic curve independent of the loading direction. Moreover, a sharp increase in the damage and plasticity levels due to the local effect occurring during cyclic loading is observed and correlated to SEM fracture surface analysis.
中文翻译：
单调和疲劳载荷下短玻璃纤维增强聚丙烯的多尺度分析
短纤维增强聚丙烯广泛用于汽车工业。疲劳失效是此类材料中观察到的最失效的模式之一。为了更好地了解损伤机理和塑性演变，本文提供了对PPGF40复合材料（由40％的短玻璃纤维重量增强的聚丙烯基质）的机械性能（包括单调和循环载荷）进行整体实验研究。分析了诸如加载方向，应变率，温度和疲劳等各种参数的影响。分析了单调和疲劳测试过程中刚度和塑性应变损失的演变。还研究了循环加载过程中的自加热。此外，通过绘制单调和循环载荷下相对刚度的相对损耗与塑性应变增量的关系图，分析了损伤与塑性的耦合效应。对于准静态载荷，结果强调了一条独立于载荷方向的固有曲线。此外，观察到由于循环加载过程中发生的局部效应而导致的破坏和塑性水平的急剧增加，并且与SEM断裂表面分析相关。
更新日期：2020-08-25
中文翻译：
单调和疲劳载荷下短玻璃纤维增强聚丙烯的多尺度分析
短纤维增强聚丙烯广泛用于汽车工业。疲劳失效是此类材料中观察到的最失效的模式之一。为了更好地了解损伤机理和塑性演变，本文提供了对PPGF40复合材料（由40％的短玻璃纤维重量增强的聚丙烯基质）的机械性能（包括单调和循环载荷）进行整体实验研究。分析了诸如加载方向，应变率，温度和疲劳等各种参数的影响。分析了单调和疲劳测试过程中刚度和塑性应变损失的演变。还研究了循环加载过程中的自加热。此外，通过绘制单调和循环载荷下相对刚度的相对损耗与塑性应变增量的关系图，分析了损伤与塑性的耦合效应。对于准静态载荷，结果强调了一条独立于载荷方向的固有曲线。此外，观察到由于循环加载过程中发生的局部效应而导致的破坏和塑性水平的急剧增加，并且与SEM断裂表面分析相关。
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