ACOUSTIC-EMISSION AND SURFACE CHECKING IN EUCALYPTUS-REGNANS BOARDS DURING DRYING

被引：14

作者：

BOOKER, JD

机构：

[1] Civil and Mechanical Engineering Department, University of Tasmania, Hobart, 7001

来源：

HOLZ ALS ROH-UND WERKSTOFF | 1994年 / 52卷 / 06期

关键词：

D O I：

10.1007/BF02615389

中图分类号：

TB3 [工程材料学]; TS [轻工业、手工业、生活服务业];

学科分类号：

0805 ; 080502 ; 0822 ;

摘要：

Acoustic emission (AE) was measured in drying 30mm thick Eucalyprus regnans F. Muell. boards. Incipient surface checks were detected with a hand-held to-times magnifying glass. Surface checks occurred at a very nearly constant AE rate (ring-down counts) in the backsawn and quartersawn boards dried at temperatures in the vicinity of 20 degrees C. At higher temperatures, collapse shrinkage beneath the board surface caused localised surface checking at significantly lower AE rates. AE is hypothesised to be generated by intermittent slips in the crystalline regions of the cellulose microfibrils comprising fibre cell walls.

引用

页码：383 / 388

页数：6

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