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Experimental characterization of the hygrothermal ageing effects on the bulk mechanical properties and lap-shear strength of the novel bio-based epichlorohydrin/cardanol adhesive
The Journal of Adhesion ( IF 2.2 ) Pub Date : 2020-09-10 , DOI: 10.1080/00218464.2020.1817742
Vasileios Tzatzadakis 1 , Konstantinos Tserpes 1
Affiliation  

ABSTRACT

In the present paper, the effects of hygrothermal ageing on the bulk mechanical properties and lap-shear strength of the novel bio-based epichlorohydrin/cardanol adhesive have been studied by tension tests, fracture toughness tests and single-lap shear tests on bonded CFRP and aluminum specimens. The thermomechanical properties of the adhesive have been characterized using dynamic mechanical analysis tests. Ageing of the specimens has been realized inside an environmental chamber under the conditions of 70°C/85%RH until saturation. The glass transition temperature of the adhesive is reduced by 13.8%. The results from the tension tests reveal that ageing has caused a reduction of Young’s modulus by 13.4% and of tensile strength by 34.9%. Fracture toughness is reduced by 3.2% while the plasticity caused by the ageing has led to a less brittle behavior. Contrary to the bulk mechanical properties, the lap-shear strength of both the CFRP and aluminum joints is not affected. These findings reveal that although Tg and tensile properties of the bio-adhesive are significantly reduced by the ageing, the fracture toughness and lap-shear strength, which largely determine the adhesion capacity of the adhesive, are not affected.



中文翻译:

湿热老化对新型生物基环氧氯丙烷/腰果酚粘合剂整体力学性能和搭接剪切强度影响的实验表征

摘要

本论文通过对粘合碳纤维复合材料的拉伸试验、断裂韧性试验和单圈剪切试验研究了湿热老化对新型生物基环氧氯丙烷/腰果酚胶粘剂的整体力学性能和搭接剪切强度的影响。铝试样。粘合剂的热机械性能已使用动态机械分析测试进行了表征。在 70°C/85%RH 的条件下,在环境室中实现了样品的老化直至饱和。粘合剂的玻璃化转变温度降低了13.8%。拉伸试验的结果表明,老化导致杨氏模量降低了 13.4%,拉伸强度降低了 34.9%。断裂韧性降低 3。2%,而老化引起的可塑性导致脆性降低。与整体力学性能相反,CFRP 和铝接头的搭接剪切强度均不受影响。这些发现表明,虽然生物粘合剂的T g和拉伸性能会因老化而显着降低,而在很大程度上决定粘合剂粘合能力的断裂韧性和搭接剪切强度不受影响。

更新日期:2020-09-10
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