Research on sample size for single-end tenacity and elongation test of raw silk

In the correct grading of single-end tenacity and elongation test of raw silk,determination of the sample size is one of the key factors.But no related theoretical study is found so far.As the singleend tenacity test gradually replaces the multifilament yarn test in raw silk,it looks more urgent and important to study the determination of sample size.Therefore,based on a great many of test data of the single-end breaking tenacity and breaking elongation,the relationship between sample size,level difference of grading and sample variance is theoretically determined by using statistical method and Monte Carlo simulation means.Therefore,a rational sample size selecting method is given.The theoretical results are verified by simulation.