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材料常數對聚氨酯密封膠拉伸強度帶來的誤差進行修正
- 發布時間 : 2023-3-27 18:56:04
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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.
材料常數對聚氨酯密封膠拉伸強度帶來的誤差進行修正
(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 18:56:04
- Views:
Information
根據不同應變速率下的單軸拉伸試驗結果，對方程(4.6)和方程(4.7)兩邊取對數，由聚氨酯密封膠拉伸強度和應變率的變化關系，可作出lnp-lns和6p-ll1E的函數關系圖，如圖4.1和圖4.2所示。分別通過線性擬合的方法及材料常數之間的關系/3=axn，獲得材料常數aro(本章所有的線性擬合均采用最小二乘法計算)根據不同溫度和不同應變速率下的單軸拉伸試驗結果，對方程(4.5)兩邊取對數，由聚氨酯密封膠拉伸強度與溫度和應變率的變化關系，可作出一城和Slril(OL6p]一000/T的函數關系圖，如圖4.3和圖4.4所示。分別通過線性擬合的方法，獲得材料常數n廳、qT)和人T)。溫度和應變率相關的聚氨酯密封膠拉伸強度函數的材料常數，如表4.2所示。因為在高溫狀態下，應變率對材料聚氨酯密封膠拉伸強度的試驗結果影響很大。故在進行常數確定的過程中，線性擬合只考慮了常溫狀態，未考慮高溫下變應變率的影響。為了增強應變率對預測結果的影響，需將Zener-Hollomon參數中的應變率項進行冪次運算。通過對模型預測結果的校對和修正，最終確定了校正應率后的Zener-Hollomon參數。因此，溫度和應變率相關的聚氨酯密封膠拉伸強度函數為:為了評估函數預測聚氨酯密封膠拉伸強度的準確性，函數預測的聚氨酯密封膠拉伸強度6p與試驗測得的聚氨酯密封膠拉伸強度6m之間的誤差RE可以表示為:RE=6p-6mX1%(4.9)6m利用上述公式計算不同應變率和不同溫度下試驗結果和預測結果拉伸的相對誤差，如表4.3所示。表4.3溫度和應變率變化下聚氨酯密封膠拉伸強度試驗結果和預測結果的相對誤差從表4.3可知，高溫狀態下對低應變率的預測結果誤差較大。這是因為高溫狀態下變應變率，材料聚氨酯密封膠拉伸強度試驗結果的變化較大，而預測模型無法跟上試驗的實際結果。最終可通過模型中的材料常數對聚氨酯密封膠拉伸強度帶來的誤差進行修正。www.freightconnects.com
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