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The dynamic characteristics of composite laminates are very complex because many concurrent phenomena occur with laminate failure under impact load. In order to research impact response and energy distribution of composite laminates in different low-impacted energies, Hashin failure criteria was taken based on the finite element software of ABAQUS, combined progressive damage stiffness reduction scheme with viscous regularization. The impact response was analyzed from the points of impact energy, contact pressure, internal energy and damage dissipation energy. The result showed that the peak of contact pressure moved forward and the different value of internal energy and damage dissipation energy became bigger with the increase of impact energy. Furthermore, impact energy would be transformed into many types of energies and the distribution of impact energy was discussed. (Received 28 April, 2018; Accepted 30 June, 2018) # corresponding author: Xiaopeng Shi (E-mail: sxp_pla_afeu@126.com) J. Fiber Sci. Technol., 74(10), 207-214 (2018) doi 10.2115/fiberst.2018-0027 ©2018 The Society of Fiber Science and Technology, Japan Impact Response and Energy Distribution of Low Velocity Impact on Composite Laminates Bin Zhou, Xiaopeng Shi, Lei Wang, Junjie Yin, Yue Liu, and Yu Hu *1Aeronautics and Astronautics Engineering College, Air Force Engineering University, Xi’an, China *2Shijiazhuang flying college, Air Force of Chinese People’s Liberation Army, Shijiazhuang, China *3Air command operation institute, Naval research institute, Shanghai, China *4Aviation center maintenance base, Air Force of Chinese People’s Liberation Army, Xi’an, China *5Air Force’s military representative office, Air Force of Chinese People’s Liberation Army, Dalian, China Journal of Fiber Science and Technology (JFST), Vol.74, No. 10 (2018) 207 predict damages of the shell-shaped structures. Tarfaoui et al. [10] tested and predicted the elastic behavior of static and dynamic loadings on thick filament wound glass/epoxy tubes and then, an impact model was designed for damage prediction. Volnei Tita et al. [11] simulated the failure mechanisms by using Hill’s and material models, and the influence of stacking sequence and impact energy level on composite plates was verified. A.R. Setoodeh et al. [12] designed a FE code for the analysis of thick composite laminates, which gave the evidence for the faster spreading of flexural waves in the direction with the greatest stiffness. Wang Y F et al. [13] tested three composite laminates with different layups under low-velocity impact via dropping weight method. The results showed that damage evolution rested theoretically with the absorbed energy but was more closely relevant to the total impact energy and the maximum contact force was only a threshold and if the peak contact force reached the threshold, a plateau emerged. In recent years, considerable amount of work on the impact response of low velocity impact on composite laminates has been carried out by many researchers. However, the research on the energy distribution of low velocity impact is lacking. In this paper, a new point of sight in impact response of low velocity impact on composite laminates has been discussed. Furthermore, the energy distribution during the impact process has been researched in depth, and the software of ABAQUS is used as a tool to verify the final conclusion. 2. Impact damage models 2.1 Impact dynamics and contact law It is known that contact law is defined as a relation between contact force and indentation. The maximum contact force and displacement are obtained by energy conservation equation. And the fundamental assumption is that all of the impact energy converts into the internal energy of the panel at the maximum contact force or maximum displacement. Energy dissipation and the damp of material and the vibration of panel are ignored. So