摘要
面内纵横剪切强度是衡量复合材料层合板强度特性的重要指标之一,而S2/430LV复合材料是目前较为常用的一种典型舰用复合材料体系。首先,依据规范GB/T 3355-2005开展±45°面内拉—剪强度试验研究,测试结果表明,在拉—剪载荷作用下,S2/430LV复合材料的载荷/位移曲线存在两阶段和弧形过渡区特征。取初始损伤后的线性段与弧形段的切点为剪切强度的基准点(对应剪切强度为τB),分别选取不同折减系数下的载荷值来开展拉—剪疲劳特性、疲劳承载后剩余刚度和强度试验研究。结果表明:计及机械疲劳承载时,S2/430LV复合材料面内剪切强度材料许用值的折减系数可取为0.75。该结论对舰艇复合材料结构可靠性设计与分析具有重要的参考意义。
Longitudinal transverse shear strength is one of the most important factors in evaluating the in- tensity of composite laminates, while S2/430LV is a typical composite material widely used in warships. This paper first investigates the intensity of ±45° ply in respect with longitudinal shear strength by referring to GB/T3355-2005. The results show that under tension-shear loads, the curves of load/displacement of S2/ 430LV display two stages as well as arc transition region characteristics. The paper then takes the tangen- tial point between the linear stages and the arc segment in the primary stage of the curves as the datum point of sheared intensity （symbolized by r8）, calculating the reduction coefficients to investigate ten- sion-shear fatigue, left stiffness, and shear strength. It is suggested that 0.75 should be taken as the reduc- tion coefficient of longitudinal shear strength for S2/430LV composite material, when allowing for reason- able mechanical fatigue. The conclusion has important reference significance for composite materials of warships in terms of reliability design and analysis.
出处
《中国舰船研究》
CSCD
北大核心
2016年第3期55-60,共6页
Chinese Journal of Ship Research
基金
国家自然科学基金面上项目(51479205)
关键词
面内纵横剪切强度
复合材料层合板
拉-剪疲劳
折减系数
longitudinal transverse shear strength
composite laminate
tension-shear fatigue
reductioncoefficient
作者简介
陈国涛，男，1990年生，硕士生。研究方向：舰船复合材料结构应用工程。E-mail：1181590188@qq．com
邓波，男，1976年生，博士生。研究方向：舰船系统工程。E-mail：9142072@qq．com
梅志远（通信作者），男，1973年生，博士，副教授。研究方向：舰船复合材料结构应用工程。E-mail：zhiyuan_mei@163．com
