• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Proceedings of the American Society for Composites Twenty-Ninth technical conference, Proceedings of the 16th US-JAPAN conference on composite materials ASTM-D30 meeting >Effect of Variable R-Ratio Loading on Fatigue Life and Damage Accumulation in Plain-Weave Fabric Carbon/Epoxy Laminates
【24h】

Effect of Variable R-Ratio Loading on Fatigue Life and Damage Accumulation in Plain-Weave Fabric Carbon/Epoxy Laminates

机译：可变R比率负载对平​​纹织物碳/环氧层压板的疲劳寿命和损伤累积的影响

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Effect of alternating R-ratios on fatigue life of a quasi-isotropic woven fabricrnCFRP laminate has been studied. First, constant amplitude fatigue tests are performedrnon coupon specimens at different stress ratios to establish a set of fatigue data that arernused as a baseline for this investigation. Then, variable R-ratio fatigue tests are carriedrnout in which the stress ratio of fatigue loading alternates between two different values,rnR1 and R2, during which either the maximum or minimum fatigue stress level is keptrnconstant depending on the pair of stress ratio (R1, R2). The fatigue life under variablernR-ratio loading is examined for different pairs of stress ratios at different constantrnlevels of maximum or minimum fatigue stress. By comparing the fatigue lives underrnconstant amplitude and variable R-ratio loading conditions, the effect of alternation inrnR-ratio on fatigue life of the woven CFRP laminate is identified. Experimental resultsrndemonstrate that for any pair of stress ratio, fatigue lives for alternation of stress ratiornbetween R1 and R2 are distributed in the range from min{Nf (R1), Nf (R2)} to two timesrnthe value. It is also found that the Miner’s sum of cycle ratios for alternating R-ratiosrnloading takes a value in the range from 0.5 and 2. The latter suggests that the linearrndamage accumulation rule is applicable to prediction of fatigue life for alternating Rratiosrnloading. Finally, an engineering methodology for prediction of fatigue lives ofrncomposites that makes use of the anisomorphic constant fatigue diagram inrnconjunction with the linear damage accumulation rule is shown to be applicable inrnalternating R-ratios loading of the quasi-isotropic woven fabric CFRP laminate withrnan accuracy by a factor of two.
机译：研究了交替的R比对准各向同性机织物CFRP层压板疲劳寿命的影响。首先，在不同应力比下对试样进行恒定振幅疲劳试验，以建立一组疲劳数据，作为本研究的基准。然后，进行可变的R比疲劳试验，其中疲劳载荷的应力比在两个不同的值rnR1和R2之间交替，在此期间，最大或最小疲劳应力水平根据一对应力比保持不变（R1， R2）。在最大或最小疲劳应力的不同恒定水平下，针对不同的应力比对，研究了可变比率负载下的疲劳寿命。通过比较恒定振幅和可变R比率载荷条件下的疲劳寿命，确定交替InrR比率对CFRP编织层压板疲劳寿命的影响。实验结果表明，对于任何一对应力比，R1和R2之间的应力比交替变化的疲劳寿命分布在从min {Nf（R1），Nf（R2）}到该值的两倍的范围内。还发现，交替交替的R荷载的Miner循环比率总和取值范围为0.5到2。后者表明线性损伤累积规则适用于交替的R荷载的疲劳寿命的预测。最后，一种利用复合材料的疲劳寿命来预测复合材料疲劳寿命的工程方法论表明，该方法利用线性损伤累积规则与线性变形累积规则不相交，可以交替地将准各向同性机织CFRP层压板的R-比载荷通过r两倍。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号