Abstract: Fatigue resistance of Laminated Veneer Lumber, Structural Plywood were investigated in this study for determining allowable design stresses for both materials as a percentage of Ultimate strength (Modulus of Rupture). Test were carried out at Selected stress levels to corresponded specific percentages of materials ultimate strength. Constant amplitude cyclic test of 1 Hz (60 cycles/minute) frequency were performed with six applied stress levels 80, 70, 60, 50, 40, 30 expressed as percentages of the materials ultimate strength.
Results indicated that Laminated Veneer Lumber, Structural Plywood, were able to survive fatigue life of over 6 lakh cycles at stress level equal to 30 and 27% of average Modulus of Rupture (MOR) respectively. It was also observed that increase in the Rate of loading decreased the percentage of allowable design stresses for all the material and vice versa. The study shows that the allowable design stress for the design applications must be based on percentage of static MOR and the frequency of cyclic loading in order to satisfy safety and service requirements.
Keywords: Allowable design stress, Laminated Veneer Lumber, Structural Plywood, fatigue, Modulus of Rupture (MOR).
Title: FATIGUE STRENGTH PROPERTIES OF LAMINATED VENEER LUMBER AND STRUCTURAL PLYWOOD
Author: Kiran M.C, Anand Nandanwar, Prakash V, Narasimhamurthy
International Journal of Civil and Structural Engineering Research
ISSN 2348-7607 (Online)
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