Mechanical Engineering Analysis and Test

Focus on Fatigue

MoreVision has developed a number of programs to post-process finite element results, calculate fatigue damage and to plot damage directly onto the FE mesh. The assessments cover code of practices used in many countries (UK - BS7608, France -UIC 515-4 Goodman Diagram, German DIN 15 018, Swedish Volvo standards)
Experimental Methods

MoreVision strain gauge testing compliments its analysis services.
Software Success

MoreVision has sold its innovative engineering calculation software Research Engineers Inc. for worldwide distribution. The product has already earned MoreVision a DTI SMART award for innovation.
Composite Analysis

MoreVision has extensive experience in the modelling composite materials.
Dynamic Analysis
Avoid resonance by performing a dynamic analysis.
Plastic Analysis
What happens when stress rises above yield? - it may not be as severe a situation as you think.

Fatigue and Fracture

MoreVision have a Particular Expertise in This Field
If a component is subject to repeated applications of structural loading then it will be susceptible to fatigue failure. Stresses act on small flaws inherent in the material causing then to grow until they break. Two approaches can be employed to assess this situation:
    • Fatigue Life Assessment.
    • Fracture Mechanics Approach.
Using stress information derived from an ANSYS structural analysis MoreVision have developed custom programs to assess fatigue life or to study crack growth.

Our library of programs includes methods of assessment used in various countries following a number of codes:
Fatigue Life Assessment
    • UK - BS7608 (fabricated steel), BS8118 (aluminium), BS5400 (bridges), BS2573 (cranes).
    • France - UIC 515-4 Goodman Diagram (railway).
    • German DIN 15 018 (cranes).
    • Swedish Volvo standards (automotive, construction equipment).
Fracture Mechanics Approach
    • UK - PD6493 (fracture).

Fatigue of Welded Structures

The fatigue life of a welded structure it totally dependant upon the choice of welded detail. In the following examples the detail on the left hand side of the page is improved by adopting the detail on the right hand side. Just three examples are given though there are generally many ways of optimising a fabricated structure.

1) Weld reinforcement and weld toe re- profiling

The fatigue life of this butt weld is improved by grinding the weld reinforcement flush with the parent plate. This reduces the stress concentration at the weld toe. Paradoxically it could be further enhanced if the weld toes are dressed back 1 to 2mm below the thickness of the parent plate! The benefit from the removal of poor quality material at weld toes which contains fatigue prone inherent flaws outweighs the slight increase in stress due to loss of net section.

2) Removal of weld stop starts

The presence of stop start defects in a weld will reduce the fatigue life of a weld.

3) Do not weld on plate edges

Welds on the edge of a stressed plate have a lower fatigue life than welds which stop 10mm short of the edge.



Top Software Tools

MoreVision have some 20 years experience of problem solving with ANSYS®. They have developed a library of macros and software tools customizing ANSYS for specific problems.
Bolted Joint Analysis
MoreVision uses 'Boltcalc' software in conjunction with FEA for fast & accurate assessments.
Partnering Client Design Teams
Will it fall off? Is it strong enough? How long will it last? These are the questions on the minds of many designers. MoreVision can team up to perform simple strength assessments to allow designers to move forward with the confidence that their designs will ultimately satisfy structural criteria.
Independent Design Audits
A fresh pair of eyes can offer an new  insight into design critical problems.
Fixed Price Contracts
Whenever possible MoreVision offers fixed price contracts from the outset of a project.
Failure Investigations
Simply strengthening an area may not give you the results you want and could make the problem worse. Before a solution can even be considered it is imperative that the mechanics of the failure are completely understood. 
Can we live with cracks?
Let MoreVision help you decide using their custom PD6493 software.
Too Hot to Handle?
MoreVision helps clients solve temperature problems.
Stress Overload?
Use MoreVision to offload work when you're too busy to cope.