Resistance welding. Destructive testing of welds. Method for the fatigue testing of multispot- welded specimens

2010 ◽  
Keyword(s):  
Fatigue Testing ◽  
Resistance Welding ◽  
Destructive Testing

Research on the Fatigue Damage Characters of the Cement Soil under Dynamic Load

2010 ◽  
Vol 160-162 ◽  
pp. 990-995 ◽  
Author(s):  
You Kai Wang ◽  
Min Xia Zhang ◽  
Ping Xu ◽  
Wen Bin Jian
Keyword(s):  
Ultrasonic Wave ◽  
Dynamic Loading ◽  
Fatigue Damage ◽  
Wave Velocity ◽  
Fatigue Testing ◽  
Testing Machine ◽  
Destructive Testing ◽  
Initial State ◽  
Ultrasonic Wave Velocity ◽  
Soil Cement

Through INSTRON1304 electric hydraulic servo fatigue testing machine, the fatigue experiment of soil-cement is done, and the ultrasonic velocity of soil-cement under dynamic loading is obtained. The results show the ultrasonic wave velocity through the cemented soil samples free surface obviously attenuates as the cycles of the dynamic loading increases. Based on the damage variable defined by the ultrasonic wave velocity, the evolution equation of soil-cement accumulated fatigue damage is established. The equation indicates that the fatigue damage of soil-cement l under dynamic loading can obviously be divided into three stages: the initial rapid decay of the initial state, stability decay and rapid damage close to the destruction. The experiment results provide an important reference for non-destructive testing of soil-cement under dynamic loading.

scholarly journals A Novel Method for High Temperature Fatigue Testing of Nickel Superalloy Turbine Blades with Additional NDT Diagnostics

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1392
Author(s):  
Dominik Kukla ◽  
Mateusz Kopec ◽  
Ryszard Sitek ◽  
Aleksander Olejnik ◽  
Stanisław Kachel ◽  
...  
Keyword(s):  
Finite Element ◽  
High Temperature ◽  
Fatigue Testing ◽  
Turbine Blades ◽  
Nickel Superalloy ◽  
Fe Model ◽  
Destructive Testing ◽  
High Temperature Fatigue ◽  
Bending Load ◽  
Novel Method

In this paper, a novel method for high temperature fatigue strength assessment of nickel superalloy turbine blades after operation at different times (303 and 473 h) was presented. The studies included destructive testing (fatigue testing at temperature 950 °C under cyclic bending load), non-destructive testing (Fluorescent Penetrant Inspection and Eddy Current method), and finite element modelling. High temperature fatigue tests were performed within load range from 5200 to 6600 N using a special self-designed blade grip attached to the conventional testing machine. The experimental results were compared with the finite element model generated from the ANSYS software. It was found that failure of turbine blades occurred in the area with the highest stress concertation, which was accurately predicted by the finite element (FE) model.

An Improved Testing Protocol for Evaluating Anterior Spinal Instrumentation Using Graft Loads in a Single-Level Cervical Discectomy or Corpectomy Model

2002 ◽  
Author(s):  
Denis J. DiAngelo ◽  
Geza Osztheimer ◽  
Kevin T. Foley
Keyword(s):  
Fatigue Testing ◽  
Spinal Instrumentation ◽  
Endurance Performance ◽  
Test Method ◽  
Destructive Testing ◽  
Spinal Implant ◽  
Single Level ◽  
Testing Protocol ◽  
American Society ◽  
Anterior Spinal Instrumentation

Anterior cervical instrumentation used in discectomy or corpectomy graft fusion should restore the mechanical integrity of the operated spine and decrease graft complications. For fusion to occur, the spinal instrumentation must load-share with the interbody graft. Recent design changes in anterior cervical plates (ACP) aim to allow motion across the fusion site and load share with the graft [1]. However, existing American Society for Testing and Materials (ASTM) standards (F1717-96) for static and fatigue testing of spinal implant constructs in a corpectomy model do not include an interbody graft in the test method [2]. The objective of this study was to develop a non-destructive testing protocol and apparatus to rank the static and low-endurance performance of ACP instrumentation in single-level discectomy and corpectomy graft-plate models.

scholarly journals Non-destructive testing of welded fatigue specimens

2020 ◽  
Vol 318 ◽  
pp. 01033
Author(s):  
Sofia Papanikolaou ◽  
Dimitrios Fasnakis ◽  
Andreas Maropoulos ◽  
Dimitrios Giagopoulos ◽  
Stergios Maropoulos ◽  
...  
Keyword(s):  
Fatigue Testing ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Metallographic Examination ◽  
Welding Method ◽  
Steel Material ◽  
The One ◽  
Non Destructive ◽  
Wheel Material ◽  
Ultrasound Testing

Non-destructive tests were conducted on welded fatigue specimens prepared using the same steel material and welding method as the one used in the manufacture and repair procedures of a KRUPP SchRs 600 bucket wheel excavator to reveal any defects present. The chemical composition, the mechanical properties, tendency to cracks and the microstructure of the bucket wheel material were determined using appropriate tests. The initiation of cracks and their subsequent growth during fatigue testing of the welded specimens was studied using ultrasound testing (UT) and a metallographic examination in order to investigate the causes of failure during service and predict fatigue life of the bucket wheel welded parts. It was found that the welding method used produces welds with numerous discontinuities that can only be detected using ultrasound techniques.

Sign in / Sign up

Export Citation Format

Share Document