FKM Linear for Welds

MESMco19

Explain how the interaction of stress concentrations may be handled.

MASco5

Discuss the general issue of scatter in material properties relevant to your analysis and simulation and how this is allowed for.

MASco8

Explain, in metallurgical terms, how fatigue cracks form and grow in metallic materials.

MASco9

Explain, in metallurgical terms, how brittle and ductile cracks form in steels and how their appearances differ.

MASkn4

List any material temperature limits (high and low) specified for the materials commonly used in your industry sector.

FATkn3

List potential sites for fatigue in your company products.

FATkn4

Sketch a sinusoidal stress variation and show the maximum stress, minimum stress, mean stress, alternating stress (or stress amplitude), stress range and stress ratio.

FATkn6

List ways of inducing beneficial compressive stresses in your company products.

FATco1

Discuss the initiation, propagation and fast fracture stages of Fatigue in metallic materials.

FATco2

Describe how the data used to construct an S-N curve are obtained.

FATco3

Discuss the term high cycle fatigue, highlighting a common source in your company products.

FATco4

Discuss the statistical nature of fatigue and explain how this is handled in relevant design standards and codes of practice.

FATco5

Discuss the salient features of an S-N diagram for steels and explain the terms endurance limit, infinite life and low cycle fatigue.

FATco7

Discuss the observed relationship between endurance limit and static tensile strength for steels and explain why this relationship does not hold for welded steels.

FATco11

Explain the use of Endurance Limit Modifying Factors in Stress-Life based fatigue assessment.

FATco12

Discuss how temperature, plate thickness and modulus effects are typically handled in relevant design standards and codes of practice and explain why this is necessary.

FATco14

Discuss the term Fatigue Strength Reduction Factor in relation to stress concentrations and explain how this has traditionally been handled in relevant design standards and codes of practice.

FATco15

Discuss the concept of cumulative damage and explain how this is commonly handled.

FATco16

Explain why a multiaxial stress field can complicate an analysis and discuss approaches to handling this.

FATco17

Discuss the significance of the choice of equivalent stress used in the fatigue assessment of welded joints

FATco18

Outline a conservative approach to situations where the directions of principal stresses vary during a stress cycle.

FATco25

Reflect on why fatigue is such a long-standing and persistent cause of failure.

FATco35

Discuss the term endurance limit for many non-ferrous metals, steels in a corrosive environment and the possible effects of load sequencing.

FATco36

Discuss any particular characteristic fatigue properties and behaviour for any materials being considered in analyses and assessment.

FATco37

Reflect on how variable amplitude load sequencing can affect the prediction of damage accumulation and fatigue life.

FATap2

Carry out elastic fatigue assessment using design standards and code guidelines for components and structures including any special procedures for ancillary components such as bolts,

FATap3

Modify the results of an elastic analysis for the effects of plasticity, where necessary.

FATap5

Use Reservoir Counting / Rainflow Method or similar to specify the necessary stress ranges, number of cycles and loading history for any component to be analysed.

FATap6

Employ a finite element analysis system for the fatigue analysis of a component or structure.

PLASap2

Use FEA to determine Limit Loads for a range of components.

PLASap7

Using standard material data, derive a true stress vs true strain curve to be used for nonlinear analysis.

PLASco21

Explain the rationale behind the 5% strain limit in some codes of practice.