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Study on Nondestructive Testing Methods for Particleboards Made of Special Composition
|關鍵字:||應力波計時儀;Stress Wave Tester(SWT);打音頻譜分析系統;振動頻率測定器;非破壞性測試;動彈性係數;靜曲彈性係數;Tap Tone Analysis System(TTAS);Vibration Frequency Tester(VFT);Nondestructive Testing(NDT);Dynamic modulus of Elasticity(MOEd);Static modulus of Elasticity(MOE)||出版社:||森林學系||摘要:||
The purpose of this research is to determine the effects of manufacturing
condition on the properties of particleboards. The kinds of nondestructive
testing（NDT）instruments, such as Stress Wave Tester（SWT）, Tap Tone
Analysis System and Vibration Frequency Tester（VFT） were applied in this
research to determine the efficience of manufacturing condition and
designed unusual factors on the properties of particleboards. The
correlations between dynamic modulus of elasticity（MOEd）and static
modulus of elasticity（MOE）, which obtained from nondestructive testing
and destructive testing respectively, were discussed. The important results
are summarized as followings：
1. The strength of particleboards made of China-fir and industrial wood
waste particles, increased with increasing glue level, press-time and density.
But, press-time of particleboards made of industrial wood waste particles
showed not significant.
2. When the China-fir wood particlebords mixed with industrial wood waste
particles, which tested by the nondestructive, and the destructive methods,
it showed highest MOEd for fully China-fir particleboards（CI-100/0）, MOE
and MOR CI-50/50 were also. In the mixing China-fir bark with wood
particles, particleboards which without included bark particles（CB-100/0
）showed highest MOEd、MOE and MOR. However, there was no significant
difference between those of 5﹪ and 10﹪ bark content（CB-95/5 and CB-
3. Particleboard which including extraneous metals and gravel sand which
could not be determined obviously.
4. The defects of particleboards made by uneven forming and uneven
moisture content with steam blister could be determined obviously by
nondestructive testing methods.
5. The correlations between nondestructive testing and destructive testing,
SWT showed lower than TTAS and VFT. The values of MOEd were higher
than MOE, and the SWT obtained highest MOEd.
|Appears in Collections:||森林學系|
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