分析应变速率对不同温度下丁基防水嵌缝胶的力学性能影响

发布时间 : 2023-3-23 11:53:23
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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.

分析应变速率对不同温度下丁基防水嵌缝胶的力学性能影响

(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 : 2023-3-23 11:53:23
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温度相关性分析

为了分析温度对丁基防水嵌缝胶的力学性能影响。在应变速率为8 10-zfs的条件下，对丁基防水嵌缝胶试件分别进行了298, 333, 363, 393和423 K的单轴拉伸试验。结果如图3.2所示。从图3.2 C a)中可知，在不同温度下，丁基防水嵌缝胶试件在拉伸过程中直至材料断裂，应力一应变曲线是非线性的。则此丁基防水嵌缝胶材料表现为粘弹性。在恒定的应变速率下，丁基防水嵌缝胶试件表现出明显的温度依赖性。随着温度的升高，非线性的斜率越来越小，丁基防水嵌缝胶试件软化现象越来越明显。

由图3.2 (b)可以看出，随着温度的升高，丁基防水嵌缝胶试件的拉伸强度在减小，其对应的应变也在减小。原因在于，温度的升高使丁基防水嵌缝胶试件出现降解现象，降解会使分子主链断裂，丁基防水嵌缝胶试件的拉伸强度下降。高温使得链段内和链段之间的结合力降低，使丁基防水嵌缝胶试件拉伸强度对应的应变减小。高温会引起软化现象，导致材料粘性的增大和弹性的减弱，材料储存弹性变形能量的能力减弱，丁基防水嵌缝胶试件的弹性模量降低。

温度对应变率相关性的分析

为了分析应变速率对不同温度下丁基防水嵌缝胶的力学性能影响。分别在298K和423K下，对丁基防水嵌缝胶试件进行应变速率为8X10一, 8X10"3和8X10一s的单轴拉伸试验。结果如图3.3所示。

从图3.3 (a)可知，在298K的常温环境温度下，材料表现出明显的速率依赖性。随着应变率的增加，丁基防水嵌缝胶试件的拉伸强度略有增加，所能承受的最大拉伸长度略有减小，应力一应变曲线的斜率也有所增加。从图3.3 Cb)可知，在423K的温度下，材料没有表现出十分显著的速率依赖性。随着应变率的增加，丁基防水嵌缝胶试件的拉伸强度增加，所能承受的最大拉伸长度也增加，但应力一应变曲线的斜率没有明显变化。www.sdyuantai.com

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