ABSTRACT

Spoolable thermoplastic composite pipe (TCP) consisting of fibre-reinforced laminate with inner and outer liners is an ideal candidate to replace steel counterparts in deepwater. In this paper, a 3D finite element (FE) model is developed to analyse stresses in TCP under combined bending and uniform temperature change illustrative of spooling in different environments. Thermal load causes deviation from the stress symmetry expected at the top/bottom of the pipe in simple bending. Maximum stress, Tsai–Hill and Hashin failure responses are analysed for [±55]₄, [±42.5]₄, [±30]₄ and [(±55)₂/(±30)₂] laminates at low and high temperatures. The [±42.5]₄ configuration displays superior spooling capacity as layers orientated at ±55° and ±30° exhibit high utilisation of relatively weak transverse tensile and fibre compressive strengths, respectively. The failure criteria are in closest agreement at the top of the pipe (under axial tension) but differ more significantly at the bottom (axial compression).

摘要

由带有内衬和外衬的纤维增强层压板组成的可缠绕热塑性复合管 (TCP) 是在深水中替代钢制管材的理想选择。在本文中，开发了一个 3D 有限元 (FE) 模型来分析 TCP 在组合弯曲和均匀温度变化下的应力，以说明不同环境中的缠绕。热负荷导致在简单弯曲中管道顶部/底部预期的应力对称偏差。_{分析了 [±55] 4}、[±42.5] ₄、[±30] ₄和 [(±55) ₂ /(±30) ₂ ] 层压板在低温和高温下的最大应力、Tsai-Hill 和 Hashin 失效响应. [±42.5] ₄配置显示出卓越的缠绕能力，因为定向在 ±55° 和 ±30° 的层分别表现出相对较弱的横向拉伸强度和纤维压缩强度的高利用率。失效标准在管道顶部（轴向拉伸）最接近，但在底部（轴向压缩）差异更大。