聚氨酯密封膠材料吸濕度和應(yīng)變率相關(guān)的非線性粘彈性的力學(xué)行為

發(fā)布時間 : 2023-3-30 11:40:13
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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.

聚氨酯密封膠材料吸濕度和應(yīng)變率相關(guān)的非線性粘彈性的力學(xué)行為

發(fā)布時間 : 2023-3-30 11:40:13
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聚氨酯密封膠吸濕度和應(yīng)變率相關(guān)的非線性粘彈性本構(gòu)模型建立通過第三章的試驗可知，吸濕度與溫度類似，也是影響聚氨酯密封膠材料力學(xué)性能的因素。因此為了描述該聚氨酯密封膠材料吸濕度和應(yīng)變率變化下試件的應(yīng)力一應(yīng)變響應(yīng)曲線，引入吸濕度的概念來表示對材料的影響，并重新對吸濕度變化狀態(tài)下的參數(shù)進(jìn)行確定，進(jìn)而形成吸濕度和應(yīng)變率影響的本構(gòu)模型，用來描述該聚氨酯密封膠材料吸濕度和應(yīng)變率相關(guān)的非線性粘彈性的力學(xué)行為。與溫度和應(yīng)變率相關(guān)的非線性粘彈性本構(gòu)模型相似，其表達(dá)式如(4.17)所示:其中，叮一應(yīng)力(MPa)￡一應(yīng)變(%)，宕一應(yīng)變率(/s一拉伸強(qiáng)度函數(shù)，Ep一拉伸強(qiáng)度對應(yīng)的應(yīng)變函數(shù)，n(HD, )一吸濕度和應(yīng)變率相關(guān)的彈性影響函數(shù)，B(HD,約一吸濕度和應(yīng)變率相關(guān)的粘性影響函數(shù)，HD一吸濕度影響因素(%)。另外，f和g為吸濕度變化條件下新的模型材料常數(shù)。

該模型與溫度和應(yīng)變率相關(guān)的非線性粘彈性本構(gòu)模型表達(dá)式的不同點(diǎn)是，娜一(赫瑞刀項改變種一ex0{面#plU.r+g>通過該項來描述吸濕度對此聚氨酯密封膠材料的力學(xué)行為影響;另外用n(Im, E)和B(F, E)項代替新模型中的n(T,e)和B(T,s) ,來描述吸濕度和應(yīng)變率對材料彈性模量非線性變化的影響。使得該模型可以表現(xiàn)硅烷改性聚聚氨酯密封膠在吸濕度和應(yīng)變率禍合影響下的非線性粘彈性行為。www.kubee.cn

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