This article is a review of models for predicting ultra-low cycle fatigue life. In the article, life prediction are divided into three types: (1) microscopic ductile fracture based on cavity growth and merger; (2) porous plasticity; (3) continuum damage mechanics. Furthermore, provides critical assessment current state research models, highlighting limitations challenges faced by each model type. Ultimately, this aims to provide comprehensive overview different available guide future in...

Fretting fatigue is a specific phenomenon. Due to the complex mechanisms and multitude of influencing factors, it still hard predict fretting life accurately, despite there being many works on this topic. This paper developed particle-swarm-optimized back propagation neural network aluminum alloys using test data gathered from published literature. A commonly used critical plane model, Smith, Watson, Topper criterion, was as contrast. The analysis result shows that proposed prediction model...

This paper investigated the effect of variable normal load on fretting fatigue mechanism. A kinetics-based Q- P curve analysis method was proposed to assist testing system design and experiment result analysis. Based this method, a biaxial designed. Experimental numerical investigation carried out discuss loading phase difference (the between bulk cyclic load) stiffness ratio pad fixture flat specimen) critical plane approach curves it is found that status partial slip regime under small...

Many fretting-related engineering failure cases are under varying normal load and bulk conditions. This complex loading condition makes fretting running regime very complicated. Since the significantly influences fretting-induced fatigue wear, it is worth discussing these conditions, which barely studied at present. Based on kinetics analysis of commonly used structure, a Q- P curves method was derived. Different conditions (proportional non-proportional) regimes (partial slip gross slip)...

Fretting fatigue is a common type of failure the bearing cap bolted joints. This paper proposes methodology to analyze fretting mechanism joint. A biaxially loading system was designed simulate under typical engine working condition. Meanwhile, submodel developed in finite element calculation contact status and stress distribution structural models. The test result shows that long inclined cracks (about 650 μm long, orientation at 17°–34°) initiate middle region interface. As increase bolt...

Abstract Magnetorheological fluid damper (MRD) is a damping device that utilizes the instantaneous variable characteristics of magnetorheological (MRF) in magnetic field to control force. At present, there are some problems with existing mechanical parametric models MRD, such as complexity parameters Bouc-Wen model, low model accuracy, and inability Bingham accurately capture hysteresis force velocity variation. In response these issues, on base MRD performance testing, dual-segment...

According to cutting loss of the head and tail hot rolling wide strip mill for width, control conditions, mode model short stroke (SSC) rough are researched given by dynamical changing roll gap SSC simulation basing on infinite element method (FEM) analysis results. When is put into use in field, width difference with body decreased. Therefore, greatly improves accuracy tail, achieves desired

Abstract In this paper, a methodology is developed to investigate the combined effect of some main factors (bolt pretension load, shear coefficient friction, and bolted joints structure) on fatigue performance joints. A parameter k, which reflects ratio bolt load used evaluate competition fretting stress concentration damage The analysis result deduces that as increase decreased, while influence increased. At crack formation position will be far away from hole center. This k can design or...

Fretting fatigue is one of the typical failure forms engine block. The aim this study to investigate fretting mechanism V type and guide design. An experiential system was developed simulate under working condition. And a submodel used in finite element calculation analyze contact status stress distribution structural model. Through experimental observations analysis, it can be concluded that additional rotate torque caused by bearing load bolt pretension are two main factors which affect...

Plant biomass estimation is critical due to the variability of different environmental factors and crop management practices associated with it. The assessment largely impacted by accurate prediction sustainability indicators. A robust model predict indicators a must for community. This study proposes analyzing using machine learning models. prospect ensemble was also investigated analyze regression problem. All experiments were carried out on residue data from Ohio state. Ten models,...