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      stressPower = half * (
     * ( stressOld(k,1) + stressNew(k,1) ) * strainInc(k,1) +
     * ( stressOld(k,2) + stressNew(k,2) ) * strainInc(k,2) +
     * ( stressOld(k,3) + stressNew(k,3) ) * strainInc(k,3) ) +
     * ( stressOld(k,4) + stressNew(k,4) ) * strainInc(k,4) +
     * ( stressOld(k,5) + stressNew(k,5) ) * strainInc(k,5) +
     * ( stressOld(k,6) + stressNew(k,6) ) * strainInc(k,6)

enerInternNew(k) = enerInternOld(k) + stressPower / density(k)£¬
stressPower±íʾµÄÓ¦±äÄÜ£¬µ«ÎªÊ²Ã´Òª³ýÒÔÃܶÈÄØ£¿
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