Fatigue endurance diagram acording to Haigh

Fatigue limit diagram according to Haigh and Smith

Fatigue limit diagrams according to Haigh or Smith show the maximum yieldable stress amplitude as a function of the mean stress. This article provides answers to the following questions, among others: How to...
Principle of ultrasonic testing

Ultrasonic testing (UT)

This article provides answers to the following questions, among others: What is the measurement principle behind ultrasonic testing?What is the coupling agent used for?How are ultrasound waves generated and received?What is the...
Setup for compression test

Compression test

This article provides answers to the following questions, among others: Why are no longish specimens used in the compression test?Why is the true compressive stress lower than the engineering stress?What is the...
Fatigue test setup

Fatigue test

The fatigue test provides information about the strength of a material under continuously changing stress (dynamic load). This article provides answers to the following questions, among others: What are the objectives of the...
Brinell hardness test procedure

Hardness test

This article provides answers to the following questions, among others: How is the hardness of materials defined?On which principles are all hardness testing methods based?Which indenter is used for Brinell hardness testing?What...
Dye penetrant inspection

Dye penetrant inspection (DPI)

This article provides answers to the following questions, among others: How is dye penetrant inspection carried out and where is it used?What is the purpose of applying the developer?Which types of cracks...
Determination of the creep diagram from creep curves

Stress rupture test (creep rupture test)

This article provides answers to the following questions, among others: What is a hot yield strength?What is creep?What factors influence the intensity of creep?At what temperatures is a technically relevant creep to...
Cupping test

Cupping test

This article provides answers to the following questions, among others: What is the cupping test (according to Erichsen)?What is cold formability? Sheets for deep-drawing applications must have very good cold formability, i.e. they...
Magnetic particle inspection (magnetic field flow method)

Magnetic particle inspection (MPI)

This article provides answers to the following questions, among others: What is the principle behind magnetic particle inspection?How should flaws be aligned with respect to the magnetic field direction so that they...
Schematic setup for stress-relaxation test

Stress-relaxation test

This article provides answers to the following questions, among others: How is the stress-relaxation test performed?For which applications is the stress-relaxation test of great importance?What is relaxation strength? In the creep rupture test,...
Measuring tool for eddy current testing

Eddy current testing (ECT)

This article provides answers to the following questions, among others: How does eddy current testing work?Why are two induction coils often connected against to each other? With eddy current testing, electrically conductive materials...