Effect of functionally graded material on frictionally excited thermoelastic instability

Thermoelastic instability of a functionally graded layer interacting with a homogeneous layer

“…Recently, the thermoelastic instability problems of FGMs were also concerned by many investigators due to their potential application to improve thermolastic stability behaviors in the brake disk system. For the frictionally-excited thermoelastic instability, Jang and his co-authors presented comprehensive works, such as, a stationary FGM layer between two sliding homogeneous layers [32], an FGM half-plane sliding against a homogeneous half-plane [33] and an FGM layer sliding against two homogeneous half-plane [34]. Their studies showed that FGMs could improve the contact stability in the frictional sliding system through an optimal gradient index of FGMs.…”

Thermoelastic instability of functionally graded materials in frictionless contact

“…As pointed out by Li [20], the system tends to a steady oscillatory state in which the contact pressure varies periodically with time, leading possibly to periodic separation if the instability occurs. Jang and his co-authors presented comprehensive studies on the frictionally excited thermoelastic instability of FGMs, such as a stationary FGM layer between two sliding homogeneous layers [21], an FGM half-plane sliding against a homogeneous half-plane [22], and an FGM layer sliding against two homogeneous half-planes [23]. Their studies revealed that an optimal gradient index of FGMs can lead to a maximum critical speed and enhance the performance of the frictional sliding system.…”

Mechanical Buckling Induced Thermoelastic Instability in Frictional Clutches

“…This in-plane sliding 2-D TEI mode was studied by Lee [12], Jang [13] and Lee [14] based on the TEI theory of Baber [10][11]. In these studies, the friction coefficient is considered a constant parameter.…”

“…For the phenomenon of circumferential distribution friction glazed spots, investigators explained this problem through thermalelastic instability (TEI) theory [10][11][12][13][14][15][16][17][18]. The reasonable explanation is that the friction glazed spots were the result of TEI when the sliding speed exceeded the value of the critical TEI velocity, and while there were pressure disturbances on the friction interfaces.…”

“…From the literature [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24], the energy of higher order thermal buckling or the phenomenon of many "hot spots" is much higher than the real working condition which leads to the circumferential distributed friction glazed spots shown in Fig.1. However, under the action of mechanical load, there exists the possibility of high order buckling, and a buckled disc will subsequently induce TEI.…”