Numerical study of high-energy low-velocity impact damage on stiffened composite panel

doi:10.19936/j.cnki.2096-8000.20240228.002

Abstract

Abstract: The high-energy wide-area blunt impact problem is a major threat for the operation safety of composite aircrafts. The Hashin criterion and the bilinear progressive damage model were adopted to simulate the in-plane ply failure, and the cohesive interface elements have been implemented to simulate the delamination. The Ogden hyperelastic material model was used to define the rubber's constitutive behavior. Numerical simulations were carried out to validate the effectiveness of the analysis methods, and then the damage characteristics of stiffened composite panel under high-energy low-velocity rigid and soft impacts were investigated. The impact response and damage process of high-energy low-velocity impact on different locations of the skin by rigid and rubber impactors were analyzed, respectively. The deformation and damage modes of stiffened composite panel during the impact process were compared and studied. The results show that the contact pressure for rigid impacts were larger, which leads to more severe local deformation and damages. The rubber impactor could blunt the impact and reduce the contact pressure, while the peak contact forces were about 23% higher than that of rigid impacts. Damages were most serious under the rigid impact at the stiffeners, in which the damages mainly located at the skin, stiffener webs and flanges, while the damages mainly located at the back of skin and stiffener webs for rubber impact. Compared with the rigid impacts, the impact damages under rubber impacts were less serious and external barely visible.

Key words: stiffened composite panel, high-energy impact, low-velocity impact, rubber impact, damage characteristic

CLC Number:

TB332

FENG Zhenyu, LI Lingling, ZOU Jun, XIE Jiang, WANG Jizhen, GUO Yazhou. Numerical study of high-energy low-velocity impact damage on stiffened composite panel[J]. COMPOSITES SCIENCE AND ENGINEERING, 2024, 0(2): 13-19.

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