热冲击和热疲劳下喷丸强化玻璃纤维增强复合材料/铝锂层压板的残余应力变化和变形,Polymer Composites

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热冲击和热疲劳下喷丸强化玻璃纤维增强复合材料/铝锂层压板的残余应力变化和变形
Polymer Composites ( IF 4.8 ) Pub Date : 2021-09-20 , DOI: 10.1002/pc.26318
Junxian Xiang ₁ , Huaguan Li _{1,

2} , Hao Wang ₁ , Hongli Li ₁ , Xi Chen ₁ , Jie Tao ₁

Affiliation

本文旨在揭示玻璃纤维增强复合材料（GFRP）/铝-锂（Al-Li）层压板在热冲击或疲劳下的变形机制，并验证复合材料喷丸成型的可靠性。本研究采用有限元模型分析喷丸后层压板的残余应力，并通过实验验证了模拟结果。结果表明，喷丸强化层压板与纯金属板相比，在两个金属外表面均表现出类似的压应力和GFRP层中的拉应力。由于模量不同，残余应力在金属/纤维和0°/90°纤维界面处发生不连续变化。此外，固化过程中产生的应力显着影响喷丸后的最终变形。随着温度从 0°C 升高到 100°C，每一层的残余应力发生变化，导致层压板的弧高降低。然而，当温度下降到 0°C 时，弧高增加到初始尺寸。证明热冲击过程几乎不影响样品几何形状。在长期热疲劳中发现了应力松弛行为。从-55°C 到 100°C 的 1100 个循环，每个循环持续 4 h，导致弧高降低 5%。对于由 GFRP/Al-Li 层压板制成并通过喷丸成型技术加工的部件，变形问题应进一步集中处理。证明热冲击过程几乎不影响样品几何形状。在长期热疲劳中发现了应力松弛行为。从-55°C 到 100°C 的 1100 个循环，每个循环持续 4 h，导致弧高降低 5%。对于由 GFRP/Al-Li 层压板制成并通过喷丸成型技术加工的部件，变形问题应进一步集中处理。证明热冲击过程几乎不影响样品几何形状。在长期热疲劳中发现了应力松弛行为。从-55°C 到 100°C 的 1100 个循环，每个循环持续 4 h，导致弧高降低 5%。对于由 GFRP/Al-Li 层压板制成并通过喷丸成型技术加工的部件，变形问题应进一步集中处理。

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Residual stress variation and deformation of shot peened glass fiber reinforced composites/aluminum–lithium laminates under thermal shock and thermal fatigue

This paper aims to reveal the deformation mechanism of glass fiber reinforced composites (GFRP)/aluminum–lithium (Al–Li) laminates under thermal shock or fatigue and verify reliability of shot peen forming for the composites. In this study, residual stresses in laminate after shot peening was analyzed using finite element model, and the simulation results were verified by experiments. It was found that the shot peened laminates, compared with pure metal panel, similarly exhibited compressive stress at the two external metal surfaces and tensile stress in GFRP layer. The residual stresses changed discontinuously at the metal/fiber and 0°/90° fiber interface owing to the different modulus. Moreover, stresses generated during curing process significantly affected the final deformation after shot peening. Residual stresses altered in each layer with the increase of temperature from 0 to 100°C, which caused the arc height of the laminate decreased. However, the arc height increased to initial dimensions when the temperature dropped to 0°C. Thermal shock process was proved that it hardly influenced the sample geometry. The stress relaxation behaviors were found in long-term thermal fatigue. 1100 cycles from −55 to 100°C, which lasted 4 h in every cycle, resulted in 5% decrease of the arc height. The deformation problem should be further concentrated on for components made of GFRP/Al–Li laminates and processed by shot peen forming technology.

更新日期：2021-09-20

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