Textile preforms have become materials of choice in numerous modern industries, partly due to their superior conformability onto complex 3D mould shapes. Maximum formability of this category of composite reinforcements, however, is still limited by defects such as wrinkling, which remains a challenging issue for composite designers during optimization of thermo-stamping operations. The aim of this article is to gain a deeper understanding of the effect of blank holding boundary condition on the extent of wrinkling as well as other local defects such as tow slippage and yarn jamming, and thereby to introduce a passive defect mitigation approach via geometrical modification of the blanks. To verify the applicability of the approach, a series of hemisphere forming experiments under unmodified and modified forming boundary conditions have been performed and compared on both single and multiple ply lay-ups, using a comingled polypropylene/E-glass thermoplastic plain weave.

纺织品预成型坯已成为许多现代工业中的首选材料，部分原因是它们对复杂的3D模具形状具有出色的顺应性。但是，这类复合材料增强材料的最大可成型性仍然受到诸如皱纹之类的缺陷的限制，这对于优化热压印操作的复合材料设计者而言仍然是一个具有挑战性的问题。本文的目的是加深对坯料夹持边界条件对起皱程度以及其他局部缺陷（如丝束滑移和纱线卡塞）的影响的了解，从而通过几何修改引入一种被动的缺陷缓解方法的空白。为了验证该方法的适用性，