Case Study: API Box Boreback Stress Relief With Truncated Threads Can Cause Premature Connection Fatigue Failure

2010 ◽  
Author(s):  
Michael Gerdes ◽  
Kang Lee
Keyword(s):  
Fatigue Failure ◽  
Stress Relief

Analysis and Mitigation Techniques for Axial Landslides to Pipeline: Case Study KM 35+690 Ocensa

2017 ◽  
Author(s):  
Andrés Ocampo ◽  
Jon Hernandez ◽  
Mauricio Pereira Ordoñez ◽  
Julian Corrales
Keyword(s):  
Stress Relief ◽  
Geotechnical Characterization ◽  
Mitigation Techniques ◽  
Soil Pipe

The present paper presents the analysis, carried out by the Ocensa pipeline, against a case of longitudinal or axial landslide to the pipeline in the KM 35 + 690, starting from the identification by inertial tool, the geotechnical characterization and the analysis of Soil-pipe interaction, excavation and stress relief and the techniques used to mitigate the effects of sliding on the pipe.

Corrosion fatigue failure of steam turbine moving blades: A case study

2019 ◽  
Vol 106 ◽  
pp. 104136 ◽  
Author(s):  
Marko Katinić ◽  
Dražan Kozak ◽  
Ivan Gelo ◽  
Darko Damjanović
Keyword(s):  
Steam Turbine ◽  
Fatigue Failure ◽  
Corrosion Fatigue

Stress assessment ahead of stoping front with widening stress relief zone – A case study of the Oktyabrsky and Talnakh deposits

2020 ◽  
pp. 38-41
Author(s):  
M. P. Sergunin ◽  
◽  
A. E. Alborov ◽  
A. A. Andreev ◽  
M. A. Buslova ◽  
...  
Keyword(s):  
Stress Relief ◽  
Stress Assessment

A case study on stress relief mining and design methods for rock-salt mine

2018 ◽  
pp. 77-86
Author(s):  
He Wang ◽  
Xiao-cong Yang ◽  
He Chen ◽  
Hui Cao ◽  
Xiu-shan Qin ◽  
...  
Keyword(s):  
Rock Salt ◽  
Stress Relief ◽  
Design Methods ◽  
Salt Mine

Case study and analysis of a fatigue failure in a THA stem

2013 ◽  
Vol 28 ◽  
pp. 166-175 ◽  
Author(s):  
Sandro Griza ◽  
Silvando Vieira dos Santos ◽  
Marcelo Massayoshi Ueki ◽  
Fabiano Bertoni ◽  
Telmo Roberto Strohaecker
Keyword(s):  
Fatigue Failure

Design of a Multi-Contact-Aided Compliant Mechanism

2011 ◽  
Author(s):  
Milton E. Aguirre ◽  
Mary Frecker
Keyword(s):  
Contact Stress ◽  
Compliant Mechanism ◽  
Stress Relief ◽  
Surgical Instruments ◽  
End User ◽  
Forming Process ◽  
Finite Element Software ◽  
Multi Stage ◽  
Jaw Opening

This work is part of a multidisciplinary project developing design and manufacturing methods for narrow-gauge surgical instruments intended for advanced minimally invasive surgery. The instruments are designed specifically for Penn State’s lost mold rapid infiltration forming process, which is capable of fabricating hundreds of freestanding meso-scale parts. In previous work, a 1 mm diameter forceps case study demonstrated the design and fabrication process. The forceps is a monolithic compliant mechanism (CM) that relies on contact to re-distribute maximum stresses to generate larger elastic tip deflections; a phenomenon defined here as contact stress-relief. Prototypes were developed and evaluated in an end user surgical simulator. Feedback from 11 clinicians identified the total jaw opening of the forceps must be increased in the next generation of prototypes. This paper focuses on exploiting the benefits of contact-aided compliant mechanism (CCM) design to obtain larger elastic tip deflections and thus jaw openings. Using the commercially available finite element software package ANSYS to model large deformation and contact, an optimization problem is developed to determine the effects of incorporating additional contact elements in a CCM design on maximizing elastic tip deflection. Results show that designs with multiple contact elements generate larger elastic tip deflections due to a multi-stage contact stress-relief profile.

scholarly journals FATIGUE FAILURE ON DRILLING PIPE THREAD: A CASE STUDY ON DRILL PIPE SS105

2021 ◽  
Vol 1 (1) ◽  
pp. 011-019
Author(s):  
Apriansyah Apriansyah ◽  
Hendri Chandra ◽  
Diah Kusuma Pratiwi ◽  
Aneka Firdaus
Keyword(s):  
Hydrostatic Pressure ◽  
Tensile Test ◽  
Fatigue Failure ◽  
Drill Pipe ◽  
Hardness Test ◽  
Experimental Tests ◽  
Critical Depth ◽  
Cause Of Failure ◽  
Drilling Operations

This study presents a case study investigation on failure analysis of drill pipe during the drilling operation and to establish a general understanding of fatigue failure with experiments and several tests. Drill pipe load comprises tensile, compression, bending, hydrostatic pressure and vibration, which causes damage due to fatigue failure to the drill pipe. The method involves subjecting a 2 in length and nominal diameter 3.25 in connection NC50 19.5 ppf drill pipe to predetermined caused failure by experimental tests and analysis. Mechanical examination such as tensile test and hardness test, and metallurgical examination such as spectrometry, fractography, SEM and EDX testing are conducted. The result shows that the cause of failure on the thread drill pipe was due to fatigue failure. It showed by the presence of microcracks, which accumulated from the load in the drill pipe. In addition, propagation of the crack at critical depth resulting in failure during drilling operations.

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