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Wood-based Materials Tested by Nondestructive Testing Methods in the Production Line
|關鍵字:||Nondestructive Testing Method;非破壞性檢測法;Ultrasonic Materials Tester;Stress Wave Timer;超音波探測儀;應力波計時儀||出版社:||森林學系||摘要:||
A b s t r a c t
The purpose of this study was focusing on the testing of plywood and particleboard in the production line and how to classify the different grades of plywood and particleboard. Because of noise problem and limit the use of testing machine, only using stress wave timer (SWT) and ultrasonic materials tester (UMT) to inspect the board in the production line, and then using SWT, UMT, TTAS, VFT to determine the properties of different materials these were brought back from plywood and particleboard mills to the laboratory, finally using destructive testing machine (universal testing machine) to obtain the value of static modulus of elasticity (MOE) ,and compare the correlation between dynamic modulus of elasticity (MOEd) and MOE. The important results are summarized as the followings:
1.In the manufacturing process of particleboard, the results showed that stress wave velocity after trimming was the fastest, stress wave velocity after hot press was secondary, then stress wave velocity after sanding was the slowest, but it showed no significant difference for statistic analysis. Secondly, although workers apply sight-measuring to be as the basis, it still has some degree of accuracy for different grades (grade A and grade B) of particleboard. Grade A and grade B particleboard of 18mm thickness showed that the strength of grade A was higher than that of grade B tested by both NDT and DT.
2.In the manufactured process of plywood, the results showed that stress wave velocity after clod press was the slowest, then stress wave velocity after hot press was the next, and stress wave velocity after trimming was the fastest, also the results of different grades of plywood (grades A , B and C of 15mm thickness)showed that there was no correlation between factory classification and the strength obtained from the NDT.
3.When using SWT and UMT to test full size of wood-based materials(plywood and particleboard), it does not affect stress wave and ultrasonic velocity too much for smaller defects on the side or smaller flaws on the surface of board.
|Appears in Collections:||森林學系|
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