Effects of temperature and clearance fit on the load distribution of composite-metal hybrid structures
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摘要: 通过有限元模拟与试验相结合的方式,研究环境温度和间隙对复合材料-金属混合结构连接钉载分配和强度的影响。分别建立双钉单剪和三钉单剪有限元模型,并在模型中综合考虑了接触、金属塑性和复合材料渐进损伤等因素,研究了不同温度和间隙情况下钉载的分配情况。研究表明,间隙对初始阶段钉载分配影响较大,但不影响塑性屈服阶段的钉载比例和承载能力;温度改变引起的热应力会带来额外的温度载荷,温度载荷对端部钉载影响较大,温度载荷与机械载荷叠加,会加剧端部钉载的分配不均。Abstract: By means of finite element modelling and experiments, the effects of temperature and clearance fit on the connection strength and load distribution of the composite-metal hybrid structure were investigated herein. The finite element models of single-shear joint with two bolts or three bolts were established respectively to study the distribution of bolt load with consideration of contact, metal plasticity and progressive damage of composite. It is shown from the results that the clearance fit has great effects on the distribution of bolt load in the initial stage, but it doesn’t affect the ratio of bolt load and bearing strength in the yield stage. The temperature change would bring additional temperature-load, which has a great impact on the load distribution of the bolts at the end. The superposition of temperature-load and mechanical load would aggravate the unevenness of load distribution for the bolts at the end.
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Key words:
- hybrid structure /
- finite element method /
- environment temperature /
- clearance /
- load distribution
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表 1 碳纤维增强环氧树脂复合材料单层板渐进损伤
Table 1. Degradation rules of the carbon fiber reinforced epoxy unidirectional tape lamina
Failure mode E11/MPa E22/MPa E33/MPa ν12 ν13 ν23 G12/MPa G13/MPa G23/MPa No failure 166000 9600 9600 0.310 0.310 0.420 4600 4600 4600 Fiber failure 33200 9600 9600 0.062 0.062 0.420 920 920 4600 Matrix failure 166000 1920 9600 0.062 0.310 0.084 920 4600 920 Delamination 166000 9600 1920 0.310 0.062 0.084 4600 920 920 Notes: E—Elasticity modulus; ν—Poisson's ratio; G—Shear modulus. 表 2 复合材料-金属混合结构连接三钉单剪间隙配合分组
Table 2. Groups of clearance fit of three bolts single-shear joints of composite-metal hybrid structure
Group Hole1 λ/% Hole2 λ/% Hole3 λ/% Nofit 0.0 0.0 0.0 Fit05 0.5 0.5 0.5 Fit10 1.0 1.0 1.0 Fit15 1.5 1.5 1.5 Fit10-00-10 1.0 0.0 1.0 Fit10-05-10 1.0 0.5 1.0 Note: λ—Ratio of clearance to bolt diameter. -
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