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专业外语课后阅读第三课page29--32DryingDefects.doc


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专业外语课后阅读第三课page29--32DryingDefects.DOC3DryingDefectspage29—,fungalandextractive.・Shrinkage-RelatedDefectsThefactthatwoodshrinksasitdriescanleadtothedevelopmentofseveraldifferentdryingdefects・Duringtheinitialorearlystagesofdrying,,however,isstillabovethefibersaturationpointandhasnotstartedtoshrink•Ineffect、thecorerestrainstheoutershellfromshrinkingasmuchasitnormallywould・・Insomecasesthestressesmaybegreaterthanmaximumstrengthandafissureorsurfacecheckresults・Asdiyingprogresses,theinnercoreultimatelybeginstofallbelowthefibersaturationpointanditshrinks・Thisistennedthesecondstageofdrying・Thetensilesetdevelopedduringthefirststageofdryinghasamajorinfluencesinceitnowrestrainsinturntheinnercorefromshrinkingnormally・Thisresultinastressreversal、pressivestressandtheinnercorebeingunderatensilestress・pressivestressonthesurfacecanfrequentlyclosethesurfacechecksthatwereeasilyvisibleduringthefirststageofdrying、

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