The CFRP laminate composite is used widely especially in aerospace industry. The design concern of this type of structure is on its strength under impact loading even under low energy impact. Under low impact loading, delamination occurs and reduce the residual strength of laminate, therefore the necessity to predict this phenomena prior to its utilization. In practice the aircraft structure is subjected to pre-stress loading such as due to aerodynamics loading while in the same time loaded under impact loading due to, for example, birds impact. This paper deals with the investigation on the delamination trend of pre-stressed CFRP composite laminate subjected to low energy and low speed impact. A FE model is proposed and validated using published data. After validation confirmation, 2 types of pre-stressed; compression and tension are used to vary the pre-stress parameter. The pre-stress is modelled by prescribe displacement at both edge of the laminate with 5 different values of −0.01, −0.05, −0.1, −0.15, −0.2 mm for compression and 0.01, 0.05, 0.1, 0.3, 0.5 mm for tension. The FE shows that maximum force during impact increases with pre-stress in compression and decreases in tension. The contact time between impactor and laminate remains constant for pre-stress in tension and increases in compression. The impactor displacement during impact is lower for tension and higher for compression. Delamination area increases regardless whether in pre-stress tension or compression. The same trend of delamination shape evolution during impact is observed both for compression and tension; ellipse evolution in transverse or perpendicular direction to the prestress direction.

CFRP层压复合材料广泛应用于航空航天工业。这种结构的设计关注点在于其在冲击载荷下的强度，即使是在低能量冲击下。在低冲击载荷下，会发生分层并降低层压板的残余强度，因此有必要在使用之前预测这种现象。在实践中，飞机结构承受预应力载荷，例如由于空气动力学载荷而同时承受冲击载荷，例如由于鸟类撞击。研究了预应力CFRP复合材料层合板在低能量低速冲击下的分层趋势。使用已发布的数据提出并验证了有限元模型。经验证确认，2种预应力；压缩和拉伸用于改变预应力参数。预应力通过在层压板的两个边缘处的规定位移建模，其中 5 个不同的值为 -0.01、-0.05、-0.1、-0.15、-0.2 毫米（用于压缩）和 0.01、0.05、0.1、0.3、0.5 毫米（用于拉伸） . 有限元表明冲击过程中的最大力随着压缩预应力的增加和张力的减小而增加。对于拉伸预应力和压缩增加，冲击器和层压板之间的接触时间保持不变。冲击过程中的冲击器位移对于拉伸较低，对于压缩较高。无论是在预应力拉伸还是压缩中，分层面积都会增加。对于压缩和拉伸，在冲击过程中观察到相同的分层形状演变趋势；