Load distribution in the thread of body

This paper presents the analytical model of load distribution in the body thread. The model estimates a variation of longitudinal strains in contiguous to the body thread layer, which takes place at the receeding from the locations of the turn loads. The influence of the wall thick-ness of the cast iron body in case of this variation at unit force is assessed by FE method. Load distributions on the turns are calculated for the steel stud connections with the compressed and tension bodies of cast iron. This paper also presents the application of the proposed model to a preliminary analysis of the relation between the stability condition of the internal defect of the tension body and the tight of the connection at high cyclic loading

In Silico Modeling the Impact of Cartilage Stiffness on Bone Tissue Stress

The knee joint is a complex biomechanical subsystem, modeling of which can reveal a deeper understanding of the processes occurring within it. The purpose of this study is to examine the stress alteration in bone based on mechanical properties of cartilage. To achieve this, a numerical model of the knee joint was developed and tested under different displacement values. The mechanical behavior of the model was represented by considering the hyperelastic properties of soft tissues, along with the verification of trabecular structure of bones, resulting in a more realistic mechanical depiction of the biological subsystem. The results showed that as the stiffness of the cartilage increased; the distribution of stresses in the bone became uneven; and stress concentrators dispersed over articular surface, while in the case of mild cartilage no stress concentrators were expressed. The proposed modeling approach allows the adaptation of patient-specific data in order to predict the outcomes of tissue diseases. The obtained results allow us to state that taking into account the non-linear properties of soft tissues is extremely important for assessing the stress state of the entire biological subsystem. The main difficulty, however, is the lack of data regarding the mechanical behavior of tissues in certain diseases

Static and cyclic strength of structural carbon and modified steels

In the article there are presented the results of experimental analytical study of the similar chemical composition but differently heat-treated structural steel: mechanical properties and resistance to cyclic loading. The indicators of strength, plasticity and cyclic failure process were determined. Fracture analysis of compact specimens (CT) was performed with SEM. It was attempted to validate the relation of mechanical properties (Rm = 500 MPa for CS500 steel and Rm = 700 MPa for CS700 steel) with stress intensity factor (ΔKth = 18 MPa∙√m for CS500 steel and ΔKth = 10 MPa∙√m for CS700 steel)