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INTRODUCTIONDuringtreegrowth,thetrunkgrowthstressesareproduced-Growthstressescanbeconsideredasakindofresidualstresses.Thestresses'existencedecreasetheeffectiveutilizationpercentoftimder,forexample,theycancausefalureoftimberend,andthismakesalotoftimbercutting;theycanmakewoodplatewarpage,and'thusitmustbereworkedinordertoreachthelevelofsellingandusingandsoon.Allofthesemakealotofwasteofwood.Accordingtothereport,inFrance,thelosscausedbygroWthstressesinbeechonlyismorethanonemillionfranceachyea… 相似文献
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