The hoop tensile strength of a composite pipe was measured experimentally using the split-disk test method. Then, a finite-element modeling was performed to simulate the split-disk test, and the progressive damage modeling was carried out to predict the maximum load the ring specimen representing the hoop tensile strength can carry. The progressive damage modeling was utilized in the context of continuum damage mechanics, where a failed ply is replaced by a virtual continuum ply with reduced mechanical properties. To degrade the mechanical properties of the failed ply, the linear damage evolution law was used in combination with a linear material softening law. The hoop tensile strength predicted agreed with experimental observations very well, validating the finite-element modeling. The damage progression was monitored during different loading stages, and the sequence of experienced failure modes was investigated. The stress concentration factor at the root of a notch was computed based on the results of finite-element analysis. The stress distribution in the vicinity of the notch was investigated, and a simple manual method was proposed for obtaining the stress in the hoop direction. The stress obtained was compared with results of the numerical simulation, and a good accuracy of the method to determine stresses without employing the finite-element modeling was found to exist.

中文翻译：

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纤维缠绕复合管环向抗拉强度的数值与试验分析

复合管的环向抗拉强度使用裂片试验方法进行实验测量。然后，进行有限元建模以模拟裂片试验，并进行渐进式损伤建模以预测代表箍抗拉强度的环形试样可以承受的最大载荷。在连续损伤力学的背景下使用渐进式损伤建模，其中失效的层被机械性能降低的虚拟连续层取代。为了降低失效层的机械性能，线性损伤演化定律与线性材料软化定律结合使用。预测的箍抗拉强度与实验观察结果非常吻合，验证了有限元建模。在不同的加载阶段监测损坏进展，并调查经历的故障模式的顺序。缺口根部的应力集中系数是根据有限元分析的结果计算出来的。研究了缺口附近的应力分布，并提出了一种简单的手动方法来获得环向应力。将获得的应力与数值模拟结果进行比较，发现在不使用有限元建模的情况下确定应力的方法具有良好的精度。研究了缺口附近的应力分布，并提出了一种简单的手动方法来获得环向应力。将获得的应力与数值模拟结果进行比较，发现在不使用有限元建模的情况下确定应力的方法具有良好的精度。研究了缺口附近的应力分布，并提出了一种简单的手动方法来获得环向应力。将获得的应力与数值模拟结果进行比较，发现在不使用有限元建模的情况下确定应力的方法具有良好的精度。