Shear Creep Properties for Bond Layer at Wood-CFRP Interface

• 作 者: Yang Xiaojun Sun Youfu
• 机 构: College of Wood Science and Technology,Nanjing Forestry University,
• 出 处: Chinese Forestry Science and Technology
• 发表日期: 2012年03期
• 关键词: creep relaxation correlative Burger contained humidity Shear maintained precisel

To know more about the bond layer’s long term properties between carbon fiber reinforced polymer(CFRP) sheets and the wood member as well as its connecting point,shear creep performance was studied using a consistent load with the Burger model.And samples were placed in dry conditions (temperature 60℃,relative humidity 90%) and wet conditions(temperature 24℃,relative humidity 45%).Results showed that the Burger model precisely simulated the bond layer’s short-term shear performance(correlative coefficient R~2≥98%). Compared to dry conditions,with wet conditions, the amount of creep was larger.Also,with an increase in thickness of the bond layer,creep deformation and stress relaxation increased.For high stress levels,a high creep rate,which could lead to a fracture of the bond layer,should be contained. Under the consideration of safety,a pressure(above 0.05 MPa) should be placed on the connection process between CFRP and wood to reduce the thickness of the bond layer.Also,in application,the shear stress level of the bond layer should be maintained within 50%of the maximum stress level.

To know more about the bond layer’s long term properties between carbon fiber reinforced polymer (CFRP) sheets and the wood member as well as its connecting point, shear creep performance was studied using a consistent load with the Burger model. And samples were placed in dry Results showed that the Burger model precisely simulated the bond layer’s short-term shear performance (correlative coefficient R ~ 2 ≧ 98% ). To compared with dry conditions, with wet conditions, the amount of creep was larger. Also, with an increase in thickness of the bond layer, creep deformation and stress relaxation increased. For high stress levels, a high creep rate, which could lead Under a fracture of the bond layer, should be contained. Under the consideration of safety, a pressure (above 0.05 MPa) should be placed on the connection process between CFRP and wood to reduce the thickness of the bond layer. Also, in appl ication, the shear stress level of the bond layer should be maintained within 50% of the maximum stress level.