丁基防水嵌缝胶温度和应变率相关的非线性粘弹性本构模型建立

发布时间 : 2023-3-24 12:18:21
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(Summary description)Customized SILICONE STRUCTURAL SEALANT from China manufacturer refers to the adhesive with high strength, can bear large load, aging resistance, fatigue resistance and corrosion resistance, and has stable performance within the expected life. It is suitable for bearing the bonding of strong structural parts. Non structural adhesive has low strength and poor durability. It can only be used for bonding, sealing and fixing of ordinary and temporary properties, and cannot be used for structural adhesive bonding. NEUTRAL SILICONE WETHERPROOF SEALANT from China manufacturer is a structural adhesive with waterproof function. Silicone glue refers to the adhesive based on silicone rubber. According to different functions, it can be divided into structural adhesive, potting adhesive, sealant, thermal conductive adhesive, flame retardant adhesive and so on.

丁基防水嵌缝胶温度和应变率相关的非线性粘弹性本构模型建立

(Summary description)Customized SILICONE STRUCTURAL SEALANT from China manufacturer refers to the adhesive with high strength, can bear large load, aging resistance, fatigue resistance and corrosion resistance, and has stable performance within the expected life. It is suitable for bearing the bonding of strong structural parts. Non structural adhesive has low strength and poor durability. It can only be used for bonding, sealing and fixing of ordinary and temporary properties, and cannot be used for structural adhesive bonding. NEUTRAL SILICONE WETHERPROOF SEALANT from China manufacturer is a structural adhesive with waterproof function. Silicone glue refers to the adhesive based on silicone rubber. According to different functions, it can be divided into structural adhesive, potting adhesive, sealant, thermal conductive adhesive, flame retardant adhesive and so on.

发布时间 : 2023-3-24 12:18:21
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通过对第三章试验结果的分析可知，丁基防水嵌缝胶密封材料在不同影响因素条件下都表现出粘弹性力学行为，是温度、吸湿度和应变率相关的高分子材料，其拉伸强度、拉伸强度对应的应变和弹性模量与温度、吸湿度和应变率相关。结合上述试验过程，分别建立描述硅烷改性丁基防水嵌缝胶材料温度和应变率相关以及吸湿度和应变率相关的非线性粘弹性本构模型。

由第三章的试验可知，温度和应变率是影响丁基防水嵌缝胶材料力学性能的重要因素。在构建本构模型时，需要重点考虑温度和应变率的藕合影响。己知可以描述金属材料在高温和不同应变率的大变形条件下的应力一应变响应。模型采用各项乘积的形式来描述应变、应变率和温度之间的关系，简单而清晰的表达材料的物理意义和应力一应变响应。模型的表达式如下:其中，6一流动应力(1),￡一等效塑性应变(%)，f一无量纲塑性应变率，T一同源温度(K)A一屈服应力(MPa)B一应变硬化系数，n一应变硬化指数，C一应变速率硬化系数，m一热软化指数。

模型通过(A+Bs0)项描述金属材料在达到其屈服应力后，应力的微小变化而带来塑性应变的急剧增长问题;通过项描述金属材料在不同的应变率下，应变速率对材料硬化行为的问题;通过项描述金属材料在高温下，温度对材料软化行为的问题。其中，硬化行为和软化行为是金属材料热塑性变形的重要特征。模型更多展现出的还是材料在弹塑性方面的表达。

对于本文的丁基防水嵌缝胶材料，试验结果更多体现了材料的粘弹性，没有屈服应力和塑性应变的存在，故(A+aE)项可以被替换。材料在不同温度下受不同应变率的影响后，没有表现出硬化现象，所以在模型的建立时忽略项。由于Johnson-Cook模型中的同源温度(厂)考虑到材料的熔化温度，而本文的丁基防水嵌缝胶材料是在玻璃化转变温度(Tg)下进行，不存在材料的熔化和溶解现象。www.sdyuantai.com

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上一篇: 聚氨酯密封胶试件随着吸湿温度的升高而出现软化现象

下一篇: 硅烷改性聚氨酯密封胶的拉伸强度受温度和应变率因素影响