Contents of Journal of Mechanical Engineering 61, 3 (2010) 



CHAUDHARI, V., KULKARNI, D. M., PRAKASH, R.: Three-dimensional finite
element analysis of fracture behaviour in general yielding fracture 
mechanics                                                              131

KUCZAJ, M., FILIPOWICZ, K.: Work parameters of torsionally flexible 
metal coupling obtained from its virtual model                         149

KUCZAJ, M., FILIPOWICZ, K.: Strain analysis of selected torsionally
flexible metal coupling units with the application of finite element 
method                                                                 159

CHOUDHARY, S. S., TUNGIKAR, V. B.: A simple higher-order theory
for dynamic analysis of composite plate                                169

LIPA, Z., PETERKA, J., POKORNY, P., VÁCLAV, Š., BURANSKY, I.: On
methods of theoretical investigation of cutting forces in metal 
machining                                                              183



Three-dimensional finite element analysis of fracture behaviour in general yielding fracture mechanics

V. V. CHAUDHARI, D. M. KULKARNI, R. PRAKASH

Three-dimensional finite element analysis is performed in order to quantify stress variation, degree of shear lip, amount of necking, and plastic zone. With the help of finite element analysis, state of stress along the crack front and along the unbroken ligament length is studied. The 3-D finite element analysis shows that the location of maximum stress level causing crack initiation is in the vicinity of the crack-tip. The effects of increasing loads on stress triaxiality are studied. At the crack initiation load the predominating plane stress condition is observed. A few observations at macroscopic level are reported which are not observed in linear elastic fracture mechanics as well as in elastic-plastic fracture mechanics. 3-D FE results are validated by experimental results.


Work parameters of torsionally flexible metal coupling obtained from its virtual model

M. KUCZAJ, K. FILIPOWICZ

The article presents the process of visualization and the accuracy of performance of the prototype of bi-directional torsionally flexible metal coupling using Autodesk Inventor Professional 2009. Selected figures from the simulations are presented and discussed on the basis of virtual model of the coupling. The results of the conducted dynamic analysis are the program-generated flow of the value of force, displacement, speed and acceleration of the specific movable elements of the coupling in the time function. Thanks to the computer simulation results it has been proved that this construction works accurately as regards kinematics in the linkage of shaped elements of the coupling.


Strain analysis of selected torsionally flexible metal coupling units with the application of finite element method

M. KUCZAJ, K. FILIPOWICZ

In this article, the results of finite element analysis (FEA) of strains derived from chosen units of torsionally flexible metal coupling are presented. As the modelling and simulation tool for particular component loads, Autodesk Inventor Professional 2009 program has been used. The analysis of obtained results ascertained that in every investigated element the yield point of material was not exceeded. The conclusion can be drawn that the analysed construction of the torsionally flexible metal coupling prototype affirms its correctness in the durability aspect.


A simple higher-order theory for dynamic analysis of composite plate

S. S. CHOUDHARY, V. B. TUNGIKAR

A four-noded rectangular, isoparametric, C0 finite element, with seven degrees of freedom at each node, is used for the dynamic (transient) analysis of laminated composite plate. The displacement model is chosen so that it can explain adequately the parabolic distribution of transverse shear stresses and the non-linearity of in-plane displacements across the thickness. The effects of lamination scheme, orthotropy, boundary conditions, and type of loading on the dynamic response of the laminate are investigated. The results of present formulation are compared with the existing analytical and numerical solutions and are found in good agreement.


On methods of theoretical investigation of cutting forces in metal machining

Z. LIPA, J. PETERKA, P. POKORNY, Š. VÁCLAV, I. BURANSKY

In the first part, the article describes selection and division of theoretical methods of investigation of cutting forces in metal machining. Further it refers to our results provided in our other contributions and finally it deals with transformation methods (with an exploitation of rheological models), which are mostly used for determining of cutting forces by drilling. The article comes to conclusion that the shown methods are successfully applicable for machining.