Zobrazeno 1 - 10
of 253
pro vyhledávání: '"Vormwald Michael"'
Publikováno v:
MATEC Web of Conferences, Vol 349, p 04004 (2021)
This work is primarily concerned with the fatigue life of high-pressure-bearing components with intersecting holes, typically used in Diesel engine fuel injection systems. The investigation focuses on specimens with intersecting holes that have under
Externí odkaz:
https://doaj.org/article/1070e359e2534183b3602d5ea4e9de32
Publikováno v:
MATEC Web of Conferences, Vol 349, p 04008 (2021)
Elastic-plastic strains at points relevant for structural failures are usually approximated using formulas based on the stresses determined by elasticity theory. For this purpose, the Neuber approximation is a common method to estimate the local elas
Externí odkaz:
https://doaj.org/article/9bb732ca73414536a28adb4ceec60660
Autor:
Tsakmakis Aris, Vormwald Michael
Publikováno v:
MATEC Web of Conferences, Vol 349, p 02001 (2021)
Phase field models have been successfully applied in recent years to a variety of fracture mechanics problems, such as quasi-brittle materials, dynamic fracture mechanics, fatigue cracks in brittle materials, as well as ductile materials. The basic i
Externí odkaz:
https://doaj.org/article/a224567a533045e7846e3f004c2e1fb3
Publikováno v:
MATEC Web of Conferences, Vol 349, p 02010 (2021)
Fatigue strength is largely affected by the influence of discontinuities: geometric notches like holes and corners in components, surface notches (roughness), pores and inclusions in the material. Therefore fatigue of structures and materials is a lo
Externí odkaz:
https://doaj.org/article/c66d3af2bb8040eb9969109fb89e9268
Publikováno v:
MATEC Web of Conferences, Vol 300, p 13003 (2019)
The fatigue assessment of notches under multiaxial and non-proportional service loading is challenging. Simple models (e.g. local strain approach based on normal stress and strain) are of poor quality for this general case of stress states and ductil
Externí odkaz:
https://doaj.org/article/1e5fa7c8672e4102a05f25c703f61b71
Autor:
Vormwald Michael
Publikováno v:
MATEC Web of Conferences, Vol 300, p 01002 (2019)
Under non-proportional mixed-mode loading conditions at the crack tip, some observations are reported. They are limited to cases of cylindrical specimens under normal force and torsion. The fatigue cracks have been initiated by the same loading for w
Externí odkaz:
https://doaj.org/article/bb3991f73eed4eb4aedc1c9b0595d498
Autor:
Tsakmakis Aris, Vormwald Michael
Publikováno v:
MATEC Web of Conferences, Vol 300, p 08009 (2019)
The configurational force concept is known to describe adequately the crack driving force in linear fracture mechanics. It seems to represent the crack driving force also for the case of elastic-plastic material properties. The latter has been recogn
Externí odkaz:
https://doaj.org/article/8cb2f9c0f9d34740b04c257b71ccba18
Publikováno v:
MATEC Web of Conferences, Vol 300, p 19001 (2019)
The Peak Stress Method (PSM) is an approximate, FE-oriented application of the notch stress intensity factor (NSIF) approach to fatigue design of welded joints, which is based on the singular linear elastic peak stresses calculated from FE analyses p
Externí odkaz:
https://doaj.org/article/73d46b2022b34809bf27ce1e114aec8c
Publikováno v:
MATEC Web of Conferences, Vol 188, p 02012 (2018)
The change in operation of power plants due to the increasing use of renewable energies causes additional stresses to the components by a high number of smaller load cycles. This fact results in a demand for validated new approaches to estimate fatig
Externí odkaz:
https://doaj.org/article/8f942f6beab1404a973e0c28feacd916
Publikováno v:
MATEC Web of Conferences, Vol 165, p 09002 (2018)
The purpose of the present contribution is to predict the fatigue life of welded joints by using the effective cyclic J-integral as crack driving force. The plasticity induced crack closure effects and the effects of welding residual stresses are tak
Externí odkaz:
https://doaj.org/article/8d78c97bc13c48cd86449599629111ac