Continuous filament and ply yarns are inherently strong enough and usually do not require boosting of their strength.
连续长丝纱和股线具有较高的强度，通常不必进一步增加强度。
2
The initial imperfection and the strength parameters are considered as random variables. Ply-level failure probability is evaluated by the first order reliability method.
初始缺陷和强度参数为设计变量，采用一阶矩法计算单元层的失效概率。
3
The present results may provide an important theoretical basis for further studying the micro-failure mechanism, ultimate strength and synergistic effect for cross-ply laminates under tension.