Mathematical Simulation And Study Of The Mechanical Properties Of Plybamboo Form In Wetting Regime

Plybamboo form is a bamboo-based panel with Moso bamboos made into bamboo woven-mat as face material and bamboo curtain as core material by a serial processes: drying, glue-application, lay-up and hot-pressing. It widely is used in building field such as high buildings, bridges, big dams and channels with good properties of strength high, large-sized panel wide, face smooth, drawing of patterns easy, waterproof, heat-resisting, wear-resisting and turnover frequency high. The properties of plybamboo form are tested mostly in dry condition by factory according to JG/T156-2004 standard, the form are used outside directly with cement mortar, the big errs are brought to working sites considering the varied property of plybamboo form due to absorbing water if design is based on dry mechanical properties of strength and rigidity of form, so there are important meanings of studying the properties of plybamboo form under wet condition .In this paper, after studying the variation of major properties of plybamboo form under water content changing, the results show that longitudinal and cross modulus of elasticity and longitudinal and cross modulus of rupture are all decreased by more than 40% with water content increasing until fibre-saturation and then keep stable. The impact bending is increased slowly with water content increasing, longitudinal impact bending increased 0.20 kJ/m2 and cross impact bending increased 0.12kJ/m2 by 10% water content increasing. The fibre-saturation of plybamboo form is about in 19.21-23.27% by using equation of regression first time, and also studied the longitudinal creep of plybamboo form under dry and wet condition, and the findings indicate that cross creep of plybamboo form is bigger than the longitudinal and wet creep bigger than dry creep.By orthogonal design of experiment, studied the immersion tests of adhesive bonds of plybamboo form with 5 factors hot-press temperature, time, press, water content of mat and amount of resin under 5 levels and the longitudinal and cross modulus of elasticity, modulus of rupture and impact bending under both dry and wet conditions, and build 13 response surface models by quadratic polynomials with analysis of variance and f-test and the results show the 13 models are great significant. And by...