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        丁基防水嵌縫膠拉伸強度對應的應變函數

        • 發布時間 : 2023-3-27 19:02:03
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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.

        丁基防水嵌縫膠拉伸強度對應的應變函數

        (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.

        • 發布時間 : 2023-3-27 19:02:03
        • Views:
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               丁基防水嵌縫膠強度力學性能測試的試驗結果表明,溫度和應變率的變化影響了此材料丁基防水嵌縫膠拉伸強度對應的應變變化。為了獲得模型中丁基防水嵌縫膠拉伸強度對應的應變函數,同樣可以將溫度和應變率影響下丁基防水嵌縫膠拉伸強度對應的應變函數關系表示為Zener-Hollomon參數相關的函數關系其中,a,和八是材料常數。Z由Zener-Hollomon參數方程中增強應變率項的模型表示,不同溫度和不同應變率條件下從表4.5可以看出,高溫狀態下低應變率的預測結果誤差較大。這與拉伸強度函數的預測結果相同。最終可通過模型中的材料常數對丁基防水嵌縫膠拉伸強度對應的應變帶來的誤差進行修正。彈性影響函數和粘性影響函數己知Johnson-Cook模型中,材料參數。表示為應變硬化指數,B表示為應變硬化系數。根據試驗結果和材料的非線性粘彈性行為,此時將模型中的。和B分別表示為溫度和應變率對此材料彈性模量非線性變化的影響,即溫度和應變率相關的彈性影響函數和粘性影響函數,即n(T,s)和B(T,e)。則n(T,s)和B(T,E)的值可通過不同溫度和不同應變率下拉伸試驗的應力一應變響應來確定[In,2l。同時,丁基防水嵌縫膠材料的試驗結果表明,沒有應變硬化現象以及熔化和溶解現象的產生。故為了通過不同溫度和應變率下的試驗結果計算該函數值,將Johnson-Cook模型中的應變率硬化項(1+ C1nE')和溫度軟化項(1-T"")忽略,并通過不同溫度和不同應變率下的應力和應變值來確定。則原模型可表示為:其中,屈服應力A由丁基防水嵌縫膠拉伸強度P代替。

               通過各個應變率和溫度下,20%, 40%, 60%, 80%和100%處的應變與其對的Zener-Hollomon上面已求出。根據不同溫度下的單軸拉伸試驗結果,對方程(4.10)兩邊取對數,由拉伸強度對應的應變和溫度的變化關系,可作出lnsp -1nZ之間的關系圖,如圖4.5所示。通過線性擬合的方法,獲得材料常數al和八。溫度和應變率相關的丁基防水嵌縫膠拉伸強度對應的應變函數的材料常數,如表4.4所示。因此,溫度和應變率相關的丁基防水嵌縫膠拉伸強度對應的應變函數為:利用公式((4.9)的誤差分析方法,評估丁基防水嵌縫膠拉伸強度對應的應變函數的準確性。表4.5溫度和應變率變化下丁基防水嵌縫膠拉伸強度對應的應變試驗結果和預測結果的相對誤差應的應力之間的關系,對方程((4.12)兩邊取對數,可以得出(6p一。)-lns的關系圖,如圖4.6所示。www.freightconnects.com

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