Strain Rate Dependent Micro- to Macroscopic Deformation Behavior of Carbon-Black Filled Rubber under Monotonic and Cyclic Straining

2007 ◽  
Vol 345-346 ◽  
pp. 53-56
Author(s):  
Yoshihiro Tomita ◽  
K. Azuma ◽  
M. Naito
Keyword(s):  
Carbon Black ◽  
Strain Rate ◽  
Cyclic Deformation ◽  
Deformation Behavior ◽  
Viscoelastic Deformation ◽  
Rate Dependent ◽  
Filled Rubber ◽  
Deformation Behaviors ◽  
The Individual ◽  
Cyclic Straining

A constitutive equation of rubber is derived by employing a nonaffine molecular chain network model for an elastic deformation behavior and the reptation theory for a viscoelastic deformation behavior. The results reveal the roles of the individual springs and dashpot, and the strain rate dependence of materials in the monotonic and cyclic deformation behaviors, particularly softening and hysteresis loss, that is, the Mullins effect, occurring in stress-stretch curves under cyclic deformation processes of carbon black filled rubber..

Strain-Rate-Dependent Deformation Behavior of Carbon-Black-Filled Rubber under Monotonic and Cyclic Straining

2007 ◽  
Vol 340-341 ◽  
pp. 1017-1024 ◽  
Author(s):  
Yoshihiro Tomita ◽  
K. Azuma ◽  
M. Naito
Keyword(s):  
Strain Rate ◽  
Cyclic Deformation ◽  
Deformation Behavior ◽  
Viscoelastic Deformation ◽  
Rate Dependent ◽  
Filled Rubber ◽  
Deformation Behaviors ◽  
Deformation Processes ◽  
The Individual ◽  
Cyclic Straining

The constitutive equation of rubber is derived by employing a nonaffine molecular chain network model for an elastic deformation behavior and the reptation theory for a viscoelastic deformation behavior. The results reveal the roles of the individual springs and dashpot, and the strain rate dependence of materials and disentanglement of molecular chains in the monotonic and cyclic deformation behaviors, particularly softening and hysteresis loss, that is, the Mullins effect, occurring in stress-stretch curves under cyclic deformation processes.

Uniaxial Cyclic Deformation Behavior of 6061Al Alloy and its Time-Dependence at Room and High Temperatures

2007 ◽  
Vol 345-346 ◽  
pp. 9-12 ◽  
Author(s):  
Guo Zheng Kang ◽  
Yu Jie Liu ◽  
Jun Ding
Keyword(s):  
High Temperatures ◽  
Cyclic Deformation ◽  
Deformation Behavior ◽  
Hold Time ◽  
Cyclic Softening ◽  
Loading Rates ◽  
Ratcheting Strain ◽  
Deformation Behaviors ◽  
Cyclic Straining ◽  
Stressing Rate

The cyclic deformation behavior of 6061Al-T6 alloy was studied by uniaxial cyclic straining or stressing tests at room and high temperatures. The cyclic softening/hardening feature of the material and its effect on the uniaxial ratcheting occurred under asymmetrical cyclic stressing were discussed. The cyclic deformation behaviors of the material presented at various loading rates and with certain peak and/or valley strain or stress holds were addressed. It is concluded from the experimental results that 6061Al-T6 alloy presents slightly cyclic softening feature, and its cyclic deformation is time-dependent even at room temperature. The ratcheting strain produced at lower stressing rate and with longer hold-time is apparently larger than that at higher stressing rate and with fewer hold-time. Some significant conclusions useful to construct the constitutive model to describe such cyclic deformation behaviors are obtained.

Uniaxial Cyclic Deformation Behaviors of 42CrMo Steel with Different Heat-Treatments

2007 ◽  
Vol 353-358 ◽  
pp. 555-558 ◽  
Author(s):  
Guo Zheng Kang ◽  
Zhao Li ◽  
Yu Jie Liu
Keyword(s):  
Strain Rate ◽  
Cyclic Deformation ◽  
Room Temperature ◽  
Annealed Sample ◽  
Cyclic Softening ◽  
Heat Treatments ◽  
Ratcheting Strain ◽  
42Crmo Steel ◽  
Deformation Behaviors ◽  
Cyclic Straining

The cyclic deformation behaviors of 42CrMo steel with different heat treatments were observed by uniaxial cyclic straining and stressing tests at room temperature. The cyclic softening/ hardening features of the tempered or annealed 42CrMo steel and their effects on the uniaxial ratcheting produced in asymmetrical cyclic stressing were discussed. It is concluded that the tempered 42CrMo steel shows significantly cyclic softening feature, but the annealed one is cyclic stabilizing. Different ratcheting behaviors are also observed. For the tempered 42CrMo steel, a special tertiary ratcheting behavior is observed and the previous cyclic straining greatly accelerates the evolution of ratcheting strain in subsequent cyclic stressing. In contrast, the annealed sample presents a stabilized ratcheting with nearly constant ratcheting strain rate after certain cycles, and the previous cyclic straining slightly influences the ratcheting in subsequent cyclic stressing.

Strain-Rate Amplification of Carbon-Black-Filled Rubber Compounds

1988 ◽  
Vol 61 (5) ◽  
pp. 938-951 ◽  
Author(s):  
Nobuyuki Nakajima
Keyword(s):  
Carbon Black ◽  
Strain Rate ◽  
Case Studies ◽  
Rubber Compound ◽  
Strain Measurements ◽  
Rate Dependent ◽  
Filled Rubber ◽  
Rubber Compounds ◽  
Dependent Strain ◽  
Is Strain

Abstract The strain amplification is one of the recognized causes of the reinforcement of rubber by carbon black. Previously, we evaluated strain amplification in nonequilibrium, i.e., stress-strain measurements. Carbon-black-filled rubber compounds were used. In these examples, not only strain but also strain rate must be amplified, since it is a dynamic situation. Because the behavior of the gum matrix is strain-rate dependent, strain-rate amplification is also an important aspect of the rubber compound behavior. In this paper, we presented case studies of strain-rate amplification with several compounds involving variation of gum rubbers and carbon blacks.

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