日期:23-04-04 時(shí)間:02:31 來源: 益榮金屬
當(dāng)Ψ(t)=0時(shí),夾芯板的中心點(diǎn)處達(dá)到最大撓度。
3-58式兩邊分別求導(dǎo),得到:
Ψ(t)=-[√(12N0/mL3)]·[w1+w2+(M0U+M0C)/N0]·sin[√(12N0/mL3)](t-T2’)
+v1cos[√(12N0/mL3)](t-T2’)
求Ψ(T’)=0,解得板的響應(yīng)時(shí)間為
T’=T2’+[√(mL3/12N0)]tan-1 v1/〔[√(12N0/mL3)][w1+w2+(M0U+M0C)/N0]〕 (3-60)
將3-60式代入3-58式,得到板中心點(diǎn)的最終撓度為:
W(T)={√[v1√(mL3/12N0)]2+[w1+w2+(M0U+M0C)/N0]2}-(M0U+M0C)/N0 (3-61)
因此,多孔金屬夾芯板在泡沫鋁金屬子彈撞擊下,板中心點(diǎn)的最終撓度和響應(yīng)時(shí)間分別為:
應(yīng)用外接正方形屈服條件:
W(T)={√[3R2v1/L2·√(mL3/12N0)]2+[w1+w2+(M0U+M0C)/N0]2}-(M0U+M0C)/N0
T=T2+[√(mL3/12N0)]tan-1 ·3R2v1/{L2[√(12N0/mL3)][w1+w2+(M0U+M0C)/N0]}
R/L<1/(√2)時(shí), (3-62)
W(T)={√[v1√(mL3/12N0)]2+[w1+w2+(M0U+M0C)/N0]2}-(M0U+M0C)/N0
T’=T2’+[√(mL3/12N0)]tan-1]·〔v1/〔[√(12N0/mL3)][w1+w2+(M0U+M0C)/N0]〕
R/L>1/(√2)時(shí), (3-63)
應(yīng)用內(nèi)接正方形屈服條件:
W(T)={√[3R2v1/L2·√(mL3/12ζN0)]2+[w1+w2+(M0U+M0C)/N0]2}-(M0U+M0C)/N0
T=T2+[√(mL3/12ζN0)]tan-1 ·3R2v1/{L2[√(12ζN0/mL3)][w1+w2+(M0U+M0C)/N0]}
R/L<1/(√2)時(shí), (3-64)
T’=T2’+[√(mL3/12ζN0)]tan-1]·〔v1/〔[√(12ζN0/mL3)][w1+w2+(M0U+M0C)/N0]〕
R/L>1/(√2)時(shí), (3-65)
其中ζ=0.5
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