摘要
纤维缠绕复合材料CNG气瓶在使用中会因碰撞造成表面损伤,如果损伤程度超过临界值,则将危及气瓶的使用安全。建立含冲击损伤的复合材料CNG气瓶的工程化评估分析方法,对安全使用复合材料CNG气瓶具有重要意义。
本文主要目的是,建立汽车用纤维环向缠绕复合材料CNG气瓶冲击损伤分析方法,为制定《压缩天然气汽车燃料系统碰撞安全要求》中有关CNG气瓶碰撞试验方法提供参考。
本文通过台车碰撞试验,研究建立一套兼顾汽车碰撞安全要求和压力容器安全性的“行李试验样块对气瓶抗冲击完整性考核”的试验方法,以及试验评价指标。
本文对玻纤单向板和纤维缠绕复合材料CNG气瓶的冲击能量和损伤程度之间的关系开展研究,经落球试验表明,分层面积可作为纤维缠绕复合材料CNG气瓶的冲击损伤表征参数,两区域分层扩展阻力交叉点为分层损伤临界值,既复合材料CNG气瓶抵抗冲击的最大能力。
考虑复合材料非线性因素对疲劳累积损伤的影响,采用能描述复合材料非线性的材料弱化系数,建立适用于非线性复合材料板的疲劳累积损伤函数,并根据疲劳累积损伤可叠加的原理,建立用图解法预测多阶段加载的疲劳寿命的分析方法。
针对表征冲击损伤参量所对应的剩余强度和安全寿命问题,结合开孔等效估算方法,建立适用于疲劳循环下的含圆孔复合材料板的疲劳寿命工程估算方法,并应用于车载纤维环向缠绕复合材料CNG气瓶冲击损伤容限的分析。
Fiber reinforced composite gas cylinders can cause surface damage from collisions during use. The safety of gas cylinders could be endangered if the extent of the damage exceeds a critical value. It is of vital significance for the safe use of CNG gas cylinders made of composite materials to establish a simplified method of evaluating impact damage on fiber reinforced composite gas cylinders.
This article proposes to establish for automotive vehicles a crash damage analytic evaluation for hoop wrapped fiber reinforced composite gas cylinders with metal liners of compressed natural gas, supporting existing regulatory languages about CNG gas cylinder crash tests in the Safety Requirement of Fuel System for Compressed Natural Gas Vehicle in Collision.
Through utilization of the impact sled test method and incorporation of criteria concerning CNG composite gas cylinders, giving consideration to the coherence between the index of passive safety and pressure vessel, this article proposes a method for testing collisions of luggage test modules and composite gas cylinders. In addition it suggests adding language to safety requirements concerning an integrated double test conducted on gas cylinder fixtures and an experiment that estimates the extent of impact damage on gas cylinders caused by luggage test modules.
This article details research on the relationship between glass/epoxy laminates and both the impact energy and the extent of damage incurred by fiber reinforced composite gas cylinders. The falling ball test indicates that the delaminated area caused by impact damage can be regarded as the Characterization Parameter for impact damage to fiber reinforced composite gas cylinders. Furthermore, the thesis purports that the cross point of the delaminated extension resistance, divided into two segments, is the delaminated damage threshold, namely the maximum capability of composite materials to resist impact.
The dissertation considers the factors influencing composite material nonlinearity on cumulative fatigue damage and suggests a weakening material factor which can describe the nonlinearity of composite material. Moreover, it establishes cumulative fatigue equations that can be applied to nonlinear materials. Furthermore, the thesis builds an analytical method for assessing fatigue life through a graphic method of multi-stage loading based on the principle of cumulative fatigue aggregation.
The thesis establishes a computational method of laminate with a circular hole under fatigue loading by means of applying hole contained equivalent method and the relationship between function of fatigue damage cumulation and residual strength equations of laminate with circle hole.
引文
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