【摘要】：研究了Ag Sn O2類材料單體觸點(diǎn)在鐓制過程中的開裂問題,并將銀絲材料拉伸試驗曲線轉(zhuǎn)化成真應(yīng)力、應(yīng)變數(shù)據(jù),擬合得到銀絲材料流變應(yīng)力數(shù)學(xué)模型。應(yīng)用有限元方法,模擬了銀單體觸點(diǎn)的冷鐓成形過程,得到了冷鐓成形過程中的等效應(yīng)變、應(yīng)力分布情況。研究結(jié)果表明,拉應(yīng)力越靠近外層越大,而徑向壓應(yīng)力則越靠近外層越小,變形物體的單位壓力從外向內(nèi)逐漸增大,因此,觸點(diǎn)最大直徑處為易開裂位置。此外,準(zhǔn)確預(yù)測了成形過程中材料產(chǎn)生裂紋缺陷的位置及裂紋程度,當(dāng)變形達(dá)到材料Damage值時,裂紋開始形成,Damage值隨變形程度的增加而上升。通過試驗,對開裂模擬結(jié)果進(jìn)行了驗證,模擬結(jié)果與試驗吻合較好。
[Abstract]:The cracking of Ag Sn O 2 monomer contact during upsetting was studied. The tensile test curve of silver wire was transformed into true stress and strain data, and the mathematical model of flow stress of silver wire was obtained. The cold heading forming process of silver monomer contact was simulated by using finite element method, and the equivalent strain and stress distribution in the cold heading forming process were obtained. The results show that the closer the tensile stress is to the outer layer and the smaller the radial compressive stress is, the larger the unit pressure of the deformed object is from the outside to the inside. Therefore, the maximum diameter of the contact point is prone to crack. In addition, the position of crack defects and the degree of crack in the forming process are accurately predicted. When the deformation reaches the Damage value of the material, the crack formation damage value increases with the increase of the deformation degree. The results of cracking simulation are verified by experiments, and the simulation results are in good agreement with the test results.
【作者單位】： 廈門金波貴金屬制品有限公司;
【基金】：國家自然科學(xué)基金資助項目(51471027)
【分類號】：TG306;TM58

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