Experimental study and phenomenological modelization of ratchet under uniaxial and biaxial loading on an austenitic stainless steel

DIC-aided biaxial fatigue tests of a 304L steel

“…The mechanical properties under monotonic tension are given in Table 2. This steel is characterized by an important ratchetting phenomenon when non-zero mean stress cyclic loadings are applied (for more information, similar results are obtained for a 316L steel [5]). Moreover its cyclic behavior is never stabilized: first comes a cyclic softening and then a secondary hardening if the number of cycles to failure is high enough ( [6]).…”

“…The strain scale is the same for the two tests and the gauge diameter (black circle) is 30mm. 16002-p. 5 An equivalent strain is chosen to compare the obtained results to uniaxial ones. To prove that the presented results do not depend much of the chosen equivalent strain, two different equivalent strains are chosen, namely the maximum strain amplitude and the von Mises equivalent strain amplitude.…”

Elastoplastic model of metals with smooth elastic–plastic transition

“…Finally, we examine the non-proportional loading behavior. Comparison with the test data of the austenitic 17-12 Mo SPH carbon stainless steel for the circular strain path ε a = 0.004 cos α and γ aθ = 0.0036 sin α under σ θ = 50 MPa during 40 cycles after the uniaxial loading to ε a = 0.004 after [8] is depicted in Fig. 9, where σ θ is the circumferential normal strain, and γ aθ is the axial-circumferential engineering shear strain, and α is the angle measured from the axis of ε a in the strain plane (ε a , γ aθ ).…”

“…8 Uniaxial cyclic loading with the increasing axial strain amplitudes ±1.0, ±1.5, ±2.0, ±2.5, ±3.0% of 316 steel (test data after [3]): a test result and simulation by present model, b test result and simulation without stagnation of isotropic hardening, c variations of normal-yield ratio and normal-isotropic hardening ratio, d simulation by Chaboche [4] and e simulation by Ellyin and Xia [10] The strain path (ε a , ε θ ) (ε θ : circumferential normal strain) and the stress path (σ a , √ 3σ aθ ) (σ aθ : axial-circumferential shear stress) are shown for the test result and the model simulation in Fig. 9a and b, respectively.…”

Некоторые Вопросы Неупругого Деформирования Материалов

“…Теоретически в рамках фено-менологического подхода указанные явления до сих пор не находят единого удовлетворитель-ного описания. Все упомянутые явления и аналогичные им, начиная с эффекта Пойнтинга [5] и осцилляции напряжений Рубина [6], и заканчивая явлением ретчета [7] и эффектом Малышева [8,9], могут быть названы, следуя работе [10], эффектами второго порядка. Предложенная ав-торами в работе [11] эндохронная теория неупругости, учитывающая конечные деформации, качественно описывает ряд перечисленных эффектов [12][13][14].…”