Simulation of cyclic plastic deformation response in SA333 C–Mn steel by a kinematic hardening model

In the present study, fatigue and fracture characteristics of sensitized marine grade Al‐Mg (AA 5754) alloy are experimentally evaluated. Received alloy is sensitized at temperatures of 150°C (SENS50) and 175°C (SENS75) for 100 hours. Fracture parameters, KIc and JIc, are experimentally evaluated. Slow strain rate tensile tests at a crosshead speed of 0.004, 0.006, and 0.01 mm/min; fatigue crack growth tests at load ratios (R = Pmin/Pmax) of 0.1, 0.2, and 0.5; and low cycle fatigue tests at four strain amplitudes of (0.3‐0.6)% are performed for SENS50 and SENS75 alloys. Relatively lower magnitude of fracture toughness values are observed for SENS75 specimen. Severe degradation in tensile properties, fatigue crack growth characteristics, and low cycle fatigue lives are observed for SENS75 samples. Extended finite element method is adopted to simulate the elasto‐plastic crack growth during fracture toughness evaluation. Scanning electron microscopy (SEM) is used to understand the failure mechanism of sensitized alloys.

“…The above material variables are calculated at highest strain amplitude. A detailed discussion on the procedure for determination of material variables is discussed in literatures …”

Section: Numerical Proceduresmentioning

confidence: 99%

Investigation of fatigue and fracture behaviour of sensitized marine grade aluminium alloy AA 5754

Kumar

Singh

2019

“…12,[21][22][23] Thin-walled tubular specimens of 13 mm in length and 7 mm of gauge length were used in testing SA333 steel. 16,24,25 Uniaxial ratcheting tests were conducted under different mean stresses, σ m , and amplitude stresses, σ a , at various stress rates. The ratcheting response of four steel alloys 42CrMo, 1020, SA333 and 304 was examined at various mean and uniaxial amplitude stresses.…”

Section: Materials and Testing Conditionsmentioning

confidence: 99%

Ratcheting assessment of steel alloys under uniaxial loading: a parametric model versus hardening rule of Bower

Ahmadzadeh

Varvani‐Farahani

2012

This study intends to compare ratcheting response of 42CrMo, 1020, SA333 and SS304 steel alloys over uniaxial stress cycles evaluated by a parametric ratcheting model and Bower's hardening rule. The parametric ratcheting equation was formulated to describe triphasic stages of ratcheting deformation over stress cycles. Mechanistic parameters of mean stress, stress amplitude, material properties and cyclic softening/hardening response of materials were employed to calibrate parametric equation. Based on the framework of cyclic plasticity theory, the modified Armstrong–Frederick nonlinear hardening rule of Bower was employed to assess ratcheting response of steel alloys under uniaxial stress cycles. Bower's model was chosen mainly due to simplicity of the model and its lower number of constants required to predict ratcheting strain over stress cycles as compared with other hardening rules. Ratcheting strain values predicted by Bower's model showed good agreements over stage I of stress cycles as compared with experimental values of ratcheting strain. Beyond of stage I stress cycles, Bower ratcheting strain rate stayed constant resulting in an arrest in ratcheting process. The predicted ratcheting strains based on the parametric equation were found in good agreements over three stages of ratcheting as compared with those of experimentally obtained.

“…19,20 Annealing operations usually cause a high cyclic hardening in the materials. The combined isotropic-kinematic hardening method 18 is used for simulating of the cyclic hardening behaviour of the material.…”

Section: And Dugdalementioning

confidence: 99%

“…The Chaboche model is an advanced material model which considers the Bauschinger effect and can predict the ratcheting behaviour. 19,20 Annealing operations usually cause a high cyclic hardening in the materials. 21 Cyclic hardening is separated into 2 different components named as "isotropic" and "kinematic" parts.…”

Section: And Dugdalementioning

confidence: 99%

Study of hardening and cyclic plastic behaviour around the crack tip of C(T) specimen made by as‐received and annealed copper

Hosseini

Seifi

2018

The purpose of this research is determining experimentally the characteristics of tension and cyclic plastic behaviours of as‐received and annealed coppers and studying distribution of stress/strain field near the crack tip. Samples made by pure copper were annealed at 420°C for 40 minutes in electric furnace. To determine the properties of the cyclic plastic behaviour, proper tests with symmetric strain‐controlled conditions were performed on standard samples. Chaboche nonlinear hardening model was used to determine the cyclic plastic behaviour of both materials. According to results, annealing process creates isotropic hardening in the copper and also changes its initial kinematic hardening behaviour. Effects of the annealing and hardening on the variations of the stresses and strains around the crack tip were investigated. Also, ratcheting and mean stress relaxations versus number of cycles, inside the plastic region, were studied.