Application Of Open-hole Diagnostic Fracture Injection Test Results To Regional Stress Interpretation In Bowen Basin Coals

2013 ◽  
Author(s):  
Mike Gibson ◽  
Saikat Mazumder ◽  
Peter Probst ◽  
Michael Scott
Keyword(s):  
Test Results ◽  
Regional Stress ◽  
Injection Test ◽  
Open Hole

scholarly journals DUS II SOIL GAS SAMPLING AND AIR INJECTION TEST RESULTS

2012 ◽  
Author(s):  
J. Noonkester ◽  
D. Jackson ◽  
W. Jones ◽  
W. Hyde ◽  
J. Kohn ◽  
...  
Keyword(s):  
Soil Gas ◽  
Air Injection ◽  
Test Results ◽  
Injection Test ◽  
Gas Sampling ◽  
Soil Gas Sampling

scholarly journals Effect of Current Transformer Impedace on Secondary Injection Accuracy

2018 ◽  
Vol 26 (5) ◽  
pp. 43-51
Author(s):  
Ameer Aqeel Mohammed ◽  
Zaid Tariq Hasan ◽  
Ghasan Ali Hussain
Keyword(s):  
Current Transformer ◽  
Test Results ◽  
Matlab Simulink ◽  
Injection Test ◽  
Traditional Procedure ◽  
Test Circuit ◽  
Secondary Injection ◽  
Secondary Winding

The traditional procedure of the secondary injection test includes splitting the secondary winding of current transformer from the test circuit. This work investigates whether the presence of the current transformer secondary winding inside the test circuit affects the accuracy of the test results or not. Matlab/Simulink has been used in this paper for modeling and simulating  the tested circuit. Paper results show that the accuracy of the test is not affected when the secondary winding of current transformer presence inside the test circuit.

Analysis of open-hole-tension plates made of short fibre thermoplastic and reinforced with continuous fibre tailored inserts

2020 ◽  
pp. 089270572096353
Author(s):  
Katharina Arnaut ◽  
M Adli Dimassi ◽  
Bernd Romahn ◽  
Ufuk Atilla ◽  
Axel S Herrmann
Keyword(s):  
Glass Fibre ◽  
Test Specimen ◽  
Damage Tolerance ◽  
Hole Injection ◽  
Test Results ◽  
Load Carrying ◽  
Short Glass Fibre ◽  
Open Hole ◽  
Reference Samples ◽  
Short Glass

In the present paper, the influence of tailored load introduction inserts applied to a bolt-loaded open-hole injection plate with different short glass fibre content is investigated. The tailored load introduction inserts made with a Tailored Fibre Placement (TFP) process, as well as open-hole injection plates without an insert were considered as reference samples. The samples were tested under tensile bolt-loading. The influence of the TFP-inserts on the load bearing properties of the open-hole injection plates was investigated. The test results show a huge increase of the load-carrying ability of the short-glass-fibre specimens when TFP-inserts are integrated. Moreover, the damage tolerance was dramatically improved as the specimens with integrated TFP-inserts did not fail abruptly and a residual strength higher than the strength of the test specimen without insert could be observed. However, the strength of the test specimen with integrated insert did not exceed the strength of the insert itself in most cases.

scholarly journals Influence of the Hole Surface Integrity on the Fatigue Strength of an Aluminium Drilled Part

2021 ◽  
pp. 34-40
Author(s):  
Alexandra Lacombe ◽  
Yann Landon ◽  
Manuel Paredes ◽  
Clément Chirol ◽  
Audrey Benaben
Keyword(s):  
Fatigue Life ◽  
Fatigue Strength ◽  
Fatigue Test ◽  
Surface Integrity ◽  
Positive Influence ◽  
Test Results ◽  
Orbital Drilling ◽  
Significant Difference ◽  
Open Hole

AbstractFatigue strengths of aluminium 2024-T351 open-hole specimens drilled by axial and orbital drilling processes are compared. Two drilling diameters (Ø) are studied: 6.35 mm and 9.53 mm. Surface integrity characterization tests are conducted in order to study the link between drilling processes, surface integrity and fatigue life. Fatigue test results show an increase of the fatigue life for specimens drilled by axial drilling for Ø = 9.53 mm and no significant difference in fatigue life between the two drilling processes for Ø = 6.35 mm. Surface integrity results show no impact of the roughness on the fatigue strength but a potential positive influence of the hole microhardness on the fatigue life.

Life enhancement of fatigue-aged fastener holes using the cold expansion process

2000 ◽  
Vol 214 (5) ◽  
pp. 281-293 ◽  
Author(s):  
J Gaerke ◽  
X Zhang ◽  
Z Wang
Keyword(s):  
Fatigue Life ◽  
Experimental Test ◽  
Load Transfer ◽  
Test Results ◽  
Expansion Process ◽  
Cold Expansion ◽  
Final Failure ◽  
Low Load ◽  
Open Hole ◽  
Life Enhancement

This paper examines the benefits of cold expanding fastener holes at various stages of the fatigue life in a 2024-T351 low-load transfer joint. The specimens were pre-cycled to 25, 50 and 75 per cent of the baseline fatigue life of a non-expanded specimen and then cold expanded prior to cycling to final failure. The experimental test was designed to provide a close comparison with standard maintenance practices for aircraft structures and used the FALSTAFF spectrum which was derived from actual flight loading. The test results have indicated that part-life cold expansion can provide substantial improvements in fatigue life, but the actual benefit is dependent upon the degree of precycling and he length of existing cracks when the specimen is cold expanded. Additionally, tests on open hole specimens of the same material and thickness were also carried out, with attempts being made to predict the crack growth lives of these specimes.

Understanding Unusual Diagnostic Fracture Injection Test Results In Tight Gas Fields - A Holistic Approach To Resolving The Data

2015 ◽  
Author(s):  
Rajarajan Narayanasamy Naidu ◽  
Ernesto A Guevara ◽  
Allan J Twynam ◽  
Jose Ignacio Rueda ◽  
William Dawson ◽  
...  
Keyword(s):  
Holistic Approach ◽  
Tight Gas ◽  
Test Results ◽  
Injection Test ◽  
Gas Fields
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