Collision Simulation Method and Protection Mechanism of Composite Fenders for Ships

doi:10.16183/j.cnki.jsjtu.2022.075

Abstract

Abstract:

Fenders play an important protective role in ship collisions, but there are few studies related to the collision simulation methods and the protection mechanism of composite fenders. First, aimed at the new composite fender design scheme proposed in this paper and based on the material properties exhibited in the test, low-density foam and hyperelastic models are selected to simulate the inner foam and outer polyurethane of the fender, respectively. Subsequently, for the hull-fender-quay collision problem, a multi-body geometry model is established and a collision simulation method is formed to analyze the fender protection mechanism from the perspective of energy conversion. It is proved that the composite material has a better protection effect on the hull structure than the rubber fender. Finally, the inner foam strength, hull stiffness, outer polyurethane thickness, and tensile strength of composite materials are varied to analyze the protection mechanism of composite materials respectively. The results show that the relative stiffness of the fender and the structure is the main factor affecting the protection performance. The inner foam of the composite fender is the main energy-absorbing structure, absorbing the kinetic energy of the hull through compression deformation to reduce the response of the structure, while the outer polyurethane mainly plays the role of protecting the core.

Key words: ship collision, numerical simulation, composite fenders, collision capability

CLC Number:

U663

LI Muzhi, BAO Wenqian, WANG Xiucheng, ZHANG Yiming, YUAN Yuchao, TANG Wenyong. Collision Simulation Method and Protection Mechanism of Composite Fenders for Ships[J]. Journal of Shanghai Jiao Tong University, 2023, 57(6): 680-689.

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网格尺寸/mm	E_total/kJ	E_pu/kJ	E_foam/kJ
22	1.805	0.172	1.633
20	1.809	0.160	1.649
15	1.807	0.125	1.682
10	1.807	0.125	1.682
8	1.805	0.125	1.680

初始动能/kJ	船体质量/t	E_total/kJ	E_pu/kJ	E_foam/kJ
2.0	12.5	1.809	0.128	1.681
2.0	25.0	1.807	0.125	1.682
2.0	50.0	1.811	0.125	1.686

护舷形式	护舷线密度/ (kg·m^-1)	护舷最大吸能/kJ	船体极限动能/kJ	护舷吸能占总能量比例/%
橡胶护舷	15.05	1.30	1.60	81.25
复合材料护舷	4.30	1.84	2.08	88.46