复合材料强度和疲劳性能的误差限度与最少试样个数
MAXIMUM ERROR LIMIT AND MINIMUM SPECIMEN NUMBER REQUIRED IN STRENGTH AND FATIGUE TESTING OF COMPOSITES
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摘要: 本文根据复合材料强度和疲劳性能分散性特点与统计学理论分析结果,探讨了复合材料强度和疲劳性能许用值误差限度的选取与最少试样个数的确定。建议选取最大误差限度δmax=10%。确定A极或B级许用值所需最大试样个数,可由式(1)计算得出,也可按离散系数值查表得出。一般不少于10～15个试样。Abstract: Large sample size is required in strength and fatigue testing of composite materials because of their big experimental data scatter. The variational coefficient, Cv,of CFRP,for instance,is 8 to 11 percent for strength tenting and 14-16% for fatigue.The experiment cost of these two properties may be very high if the reliable experimental results is required.
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