The high strain rate tension behaviour of pseudo-ductile high performance thin ply composites
The high strain rate tension behaviour of pseudo-ductile high performance thin ply composites
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DOI：
10.1016/j.compstruct.2019.02.068
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发表时间：
2019-05-01
影响因子：
6.3
通讯作者：
Wisnom, Michael R.
中科院分区：
文献类型：
--
作者：
Fotouhi, Mohamad;Fuller, Jonathan;Wisnom, Michael R.
本文研究了拉伸应变率对两种不同类型的薄层假塑性层合板的影响。其中包括由低应变薄层碳/环氧和高应变玻璃/环氧预浸料制成的单向(UD)和准各向同性(QI)杂化复合材料，以及由S薄板(称为角铺层(AP)复合材料)制成的全碳层压板。层压板的设计和承受的十字头速度范围从2 mm/分钟(0.0003 S(-1))到10m/S(100 S(-1))。所设计的层合板分别由低应变和高应变单向预浸料的单一或混合材料制成，即薄层碳/环氧和玻璃/环氧。得到了每个试件的动态应力-应变曲线和损伤机理的详细信息，并与准静态试验结果进行了比较。所研究的UD和QI薄层混杂复合材料层合板在不同应变率下均表现出良好的伪塑性，而AP层合板具有应变率依赖性，伪塑性随应变率的增加而降低。
In this study the effect of strain rate in tension on two different types of thin-ply pseudo-ductile laminates is reported. These comprised Unidirectional (UD) and quasi-isotropic (QI) hybrids made from low strain thin-ply carbon/epoxy and high strain glass/epoxy prepreg and all-carbon laminates made from thin-ply [+/- circle minus/0]s laminates referred to as angle-ply (AP) composites. Laminates were designed and subjected to a range of crosshead speeds from 2 mm/min (0.0003 s(-1)) to 10 m/s (100 s(-1)). The designed laminates were made from single or hybrids of low strain and high strain unidirectional prepregs, i.e. thin-ply Carbon/epoxy and Glass/epoxy, respectively. Dynamic stress-strain plots and details of the damage mechanisms were obtained for each sample and compared with the quasi-static test results. The investigated thin-ply UD and QI hybrid composite laminates showed excellent pseudo-ductility at different strain rates, whereas the AP laminates were strain rate dependent and pseudo-ductility decreased with increasing strain rate.