Impact of Strain-Induced Crystallization on Fast Crack Growth in Stretched cis-1,4-Polyisoprene Rubber,ACS Macro Letters

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Impact of Strain-Induced Crystallization on Fast Crack Growth in Stretched cis-1,4-Polyisoprene Rubber
ACS Macro Letters ( IF 5.1 ) Pub Date : 2022-05-19 , DOI: 10.1021/acsmacrolett.2c00241
Ryosuke Osumi ₁ , Tomohiro Yasui ₂ , Ruito Tanaka ₂ , Thanh-Tam Mai _{1,

3} , Hideaki Takagi ₄ , Nobutaka Shimizu ₄ , Katsuhiko Tsunoda ₅ , Shinichi Sakurai ₂ , Kenji Urayama _{1,

6}

Affiliation

cis-1,4-Polyisoprene (IR) elastomers harden via strain-induced crystallization (SIC) when the imposed stretch (λ) exceeds the onset value of SIC (λ*). We investigate the Mode-I fast crack growth in the IR sheets as a function of λ in a pure shear geometry. The steady-state crack velocity (V) increases with increasing λ, and V exceeds the shear wave speed of sound at λ > λ_s. Further stretch beyond λ* (>λ_s) causes SIC-driven hardening, resulting in a pronounced increase in V. The characteristics of the crack-tip strain field are also significantly influenced by the SIC-driven hardening: The crack-tip opening displacement increases with increasing λ at λ < λ* but exhibits an abrupt reduction beyond λ*. The crack-tip singularity and the area of strain increment caused by the crack growth change discontinuously around λ*. The abrupt variations in these crack-tip characteristics result from the considerable differences in the mechanical properties prior to the crack growth between the entirely amorphous state at λ < λ* and the partially crystallized state at λ > λ*.

中文翻译：

应变诱导结晶对拉伸顺式-1,4-聚异戊二烯橡胶快速裂纹扩展的影响

当施加的拉伸 (λ) 超过 SIC (λ*) 的起始值时，顺式-1,4-聚异戊二烯 (IR) 弹性体通过应变诱导结晶 (SIC) 硬化。我们研究了 IR 片中的 I 型快速裂纹扩展作为纯剪切几何中 λ 的函数。稳态裂纹速度 ( V ) 随着 λ 的增加而增加，并且V在 λ > λ _s处超过声音的剪切波速度。超过 λ* (>λ _s ) 的进一步拉伸导致 SIC 驱动的硬化，导致V显着增加. 裂纹尖端应变场的特性也受到 SIC 驱动硬化的显着影响：裂纹尖端张开位移在 λ < λ* 时随着 λ 的增加而增加，但在超过 λ* 时表现出突然减小。裂纹扩展引起的裂纹尖端奇异性和应变增量面积在λ*附近不连续变化。这些裂纹尖端特性的突然变化是由于在裂纹扩展之前的机械性能在 λ < λ* 处的完全非晶态和 λ > λ* 处的部分结晶状态之间存在相当大的差异。

更新日期：2022-05-19

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