中国物理B ›› 2024, Vol. 33 ›› Issue (1): 16102-16102.doi: 10.1088/1674-1056/acf82c

所属专题: SPECIAL TOPIC — States and new effects in nonequilibrium

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Anelasticity to plasticity transition in a model two-dimensional amorphous solid

Baoshuang Shang(尚宝双)   

  1. Songshan Lake Materials Laboratory, Dongguan 523808, China
  • 收稿日期:2023-07-05 修回日期:2023-08-17 接受日期:2023-09-09 出版日期:2023-12-13 发布日期:2023-12-13
  • 通讯作者: Baoshuang Shang E-mail:shangbaoshuang@sslab.org.cn
  • 基金资助:
    Project supported by Guangdong Major Project of Basic and Applied Basic Research, China (Grant No. 2019B030302010), the National Natural Science Foundation of China (Grant No. 52130108), Guangdong Basic and Applied Basic Research, China (Grant No. 2021B1515140005), and Pearl River Talent Recruitment Program (Grant No. 2021QN02C04).

Anelasticity to plasticity transition in a model two-dimensional amorphous solid

Baoshuang Shang(尚宝双)   

  1. Songshan Lake Materials Laboratory, Dongguan 523808, China
  • Received:2023-07-05 Revised:2023-08-17 Accepted:2023-09-09 Online:2023-12-13 Published:2023-12-13
  • Contact: Baoshuang Shang E-mail:shangbaoshuang@sslab.org.cn
  • Supported by:
    Project supported by Guangdong Major Project of Basic and Applied Basic Research, China (Grant No. 2019B030302010), the National Natural Science Foundation of China (Grant No. 52130108), Guangdong Basic and Applied Basic Research, China (Grant No. 2021B1515140005), and Pearl River Talent Recruitment Program (Grant No. 2021QN02C04).

摘要: Anelasticity, as an intrinsic property of amorphous solids, plays a significant role in understanding their relaxation and deformation mechanism. However, due to the lack of long-range order in amorphous solids, the structural origin of anelasticity and its distinction from plasticity remain elusive. In this work, using frozen matrix method, we study the transition from anelasticity to plasticity in a two-dimensional model glass. Three distinct mechanical behaviors, namely, elasticity, anelasticity, and plasticity, are identified with control parameters in the amorphous solid. Through the study of finite size effects on these mechanical behaviors, it is revealed that anelasticity can be distinguished from plasticity. Anelasticity serves as an intrinsic bridge connecting the elasticity and plasticity of amorphous solids. Additionally, it is observed that anelastic events are localized, while plastic events are subextensive. The transition from anelasticity to plasticity is found to resemble the entanglement of long-range interactions between element excitations. This study sheds light on the fundamental nature of anelasticity as a key property of element excitations in amorphous solids.

关键词: amorphous solid, deformation mechanism, anelasticity to plasticity transition, molecular dynamics simulation

Abstract: Anelasticity, as an intrinsic property of amorphous solids, plays a significant role in understanding their relaxation and deformation mechanism. However, due to the lack of long-range order in amorphous solids, the structural origin of anelasticity and its distinction from plasticity remain elusive. In this work, using frozen matrix method, we study the transition from anelasticity to plasticity in a two-dimensional model glass. Three distinct mechanical behaviors, namely, elasticity, anelasticity, and plasticity, are identified with control parameters in the amorphous solid. Through the study of finite size effects on these mechanical behaviors, it is revealed that anelasticity can be distinguished from plasticity. Anelasticity serves as an intrinsic bridge connecting the elasticity and plasticity of amorphous solids. Additionally, it is observed that anelastic events are localized, while plastic events are subextensive. The transition from anelasticity to plasticity is found to resemble the entanglement of long-range interactions between element excitations. This study sheds light on the fundamental nature of anelasticity as a key property of element excitations in amorphous solids.

Key words: amorphous solid, deformation mechanism, anelasticity to plasticity transition, molecular dynamics simulation

中图分类号:  (Disordered solids)

  • 61.43.-j
62.40.+i (Anelasticity, internal friction, stress relaxation, and mechanical resonances) 71.55.Jv (Disordered structures; amorphous and glassy solids)