Uniaxial ratchetting behavior of vulcanized natural rubber

Abstract

Most of rubber engineering components endure cyclic loading during their service, and a nonzero mean stress during cyclic loading may cause an accumulation of strain which is known as ratchetting phenomenon. In order to study the ratcheting effect of rubber, a series of uniaxial ratchetting experiments were conducted on vulcanized natural rubber (NR). The effects of cyclic stress amplitude, mean stress and their histories on ratchetting behavior were studied, respectively. The uniaxial ratchetting behavior of natural rubber depends greatly on the stress amplitude and mean stress. The ratchetting strain rate greatly increases with the stress amplitude or mean stress increased. Experimental results reveal that the rubber material exhibits a strong memory of the previous high loading history, and such memory plays a significant role on the subsequent ratchetting. The ratchetting behaviors of the rubber exhibit little sensitive to the applied cyclic stress rate except for the initial strain. POLYM. ENG. SCI., 48:191–197, 2008. © 2007 Society of Plastics Engineers

An experimental study on uniaxial ratcheting of polycarbonate polymers with different molecular weights

“…3, it is seen that: (1) apparent ratcheting occurs during the cyclic tests of both the PC-7030PJ and PC-7020PJ polymers. The ratcheting strain increases with the number of cycles in the direction of tensile mean stress, while the ratcheting strain rate decreases rapidly in the first beginning of cyclic loading and a stable ratcheting with a constant ratcheting strain rate is reached after certain cycles, which is similar to that observed in the cyclic tests of other polymer materials [13][14][15][16][17][18].…”

“…Shariati et al [15] experimentally investigated the uniaxial ratcheting and fatigue failure of polyacetal polymer. Yu et al [16,17] observed the uniaxial and multiaxial ratcheting behaviors of vulcanized natural rubber. Pan et al [18] demonstrated that the ratcheting deformation of polyetherimide polymer would occur both before and after the apparent yield, which is different from that of metal materials discussed in [3,5,8,11,12].…”

Minor addition induced enhancement of strength of Mg-based bulk metallic glass

“…The smaller the v is, the more brittle the BMGs become. This correlation was verified in various BMGs with markedly different plasticity [20][21][22]. The mass densities q and the elastic moduli at room temperature for Mg 65 Cu 25 Y 10Àx Gd x system are shown in Table 1 Fig.…”

Thermal cycling aging effects on the ratcheting behavior of anisotropic conductive film

“…For example, Chen et al investigated the uniaxial ratcheting behavior of PTFE under cyclic compression and constructed a simple constitutive model with stress rate effects (Chen and Hui, 2005;Zhang et al, 2008). Other polymer materials have also been investigated by various authors (Yu et al, 2008;Wang et al, 2010;Shariati et al, 2012;Avanzini, 2008;Liu et al, 2008;Li et al, 2013;Xu et al, 2014). The effect of thermal cycling aging on materials and structures has been adequately documented to improve the stability and reliability of the components Pang et al, 2001;Chiu et al, 2002;Jang et al, 2012).…”