Selection of Drill Pipes Based on Critical Loading Conditions for Slim Hole Drilling

1996 ◽  
Author(s):  
F. Akgun ◽  
D. Estrella ◽  
S. Rahman ◽  
B. Mitchell ◽  
A. Eustes
Keyword(s):  
Hole Drilling ◽  
Loading Conditions ◽  
Critical Loading ◽  
Drill Pipes ◽  
Selection Of

Flexural behaviour of glass fibre-reinforced plastic laminates with drilled hole

2012 ◽  
Vol 226 (2) ◽  
pp. 149-158 ◽  
Author(s):  
P K Rakesh ◽  
I Singh ◽  
D Kumar
Keyword(s):  
Glass Fibre ◽  
Polymer Matrix Composites ◽  
Element Model ◽  
Hole Drilling ◽  
Loading Conditions ◽  
Flexural Behaviour ◽  
Reinforced Plastic ◽  
Glass Fibre Reinforced Plastic ◽  
Glass Fibre Reinforced ◽  
Plastic Laminates

Drilling is one of the most commonly used process for hole making. Drilling of polymer matrix composites (PMCs) causes substantial damage around the drilled hole. Drilling-induced damage not only decreases the strength of the composite laminate with hole, but it also deteriorates the long-term performance of the PMC laminates under different loading conditions. In the present research investigation, the flexural behaviour of the glass fibre-reinforced plastic laminates with drilled hole was experimentally investigated under three-point loading conditions. The results of the experimental investigation were compared with those of the finite element model and were found to be in close agreement.

Determination of the critical loading conditions for bridges under crossing trains

2011 ◽  
Vol 33 (2) ◽  
pp. 320-329 ◽  
Author(s):  
Alessandra Zambrano
Keyword(s):  
Loading Conditions ◽  
Critical Loading

Corrosion analysis of G105 coating drill-pipe washout

2014 ◽  
Vol 61 (6) ◽  
pp. 365-369 ◽  
Author(s):  
Zhouyang Lian ◽  
Dongsheng Chen ◽  
Wuji Wei ◽  
Yongzhang Zhou ◽  
Juncheng Jiang
Keyword(s):  
Design Methodology ◽  
Drill Pipe ◽  
Corrosion Process ◽  
Pipe Surface ◽  
Content Type ◽  
Pit Nucleation ◽  
Drill Pipes ◽  
Microstructure Of The Material ◽  
Pipe Materials ◽  
Selection Of

Purpose – The purpose of this study was to investigate the reason of G105 coated drill-pipes suffering from washout after drilling for 70000–80000 m. Design/methodology/approach – The microstructure, micromorphology and corrosion products near the washout were analyzed by metallurgical microscopy, SEM and EDS. Findings – Results showed the metallographic microstructure of the material was typical tempered sorbite. No fatigue crack was observed. Drill-pipe washout was caused mainly by the inclusion of MnS in steel because of the excess S and by damaged coating, both of which induced pit nucleation and promoted the pitting corrosion process. The corrosion hole extended from the interior to the exterior, which resulted in the fracturing of the external drill-pipe surface under pressure. Originality/value – This paper can give practical help to the selection of drill pipe materials in the future.

Arbitrarily Oriented Cracks in a Reinforced Sheet

1985 ◽  
Vol 52 (1) ◽  
pp. 13-18 ◽  
Author(s):  
C.-C. Chu
Keyword(s):  
Boundary Conditions ◽  
Failure Mode ◽  
Fiber Orientation ◽  
Loading Condition ◽  
Elastic Interaction ◽  
Fundamental Solutions ◽  
Relative Orientation ◽  
Loading Conditions ◽  
Present Formulation ◽  
Critical Loading

The elastic interaction between a crack and a fiber is studied for various loading conditions. Generalized from earlier work by Greif and Sanders, the present formulation is valid for arbitrary relative orientation between the crack and the fiber. Helpful design information, such as the critical loading condition and the critical fiber orientation to trigger a certain failure mode, is therefore attainable. The fundamental solutions, each associated with proper parameters and proper boundary conditions, can also be superposed to model more realistic problems.

A Comprehensive Comparison Between Different Multiaxial Cycle Counting Procedure

2021 ◽  
Author(s):  
Andrea Rovinelli ◽  
Mark C. Messner ◽  
T.-L. Sham
Keyword(s):  
High Temperature ◽  
Strain Range ◽  
Loading Conditions ◽  
Loading History ◽  
Counting Procedure ◽  
Dwell Fatigue ◽  
Comprehensive Comparison ◽  
High Temperature Components ◽  
Open Question ◽  
Selection Of

Abstract High-temperature nuclear design codes, such as Section III, Division 5 of the American ASME Boiler and Pressure Vessel Code and the French RCC-MRx, require evaluating fatigue damage for qualifying high-temperature components. Both codes provide clear guidance for counting cycles under uniaxial loading conditions, but neither provides a cycle counting procedure for multiaxial loading conditions. The ASTM E1049 also does not address multiaxial cycle counting. However, several widely utilized multiaxial cycle counting procedures are available in the open literature, but there is no agreement on the most appropriate method for high-temperature applications. Applying the different cycle counting methods to the same loading history generally produces different results. Comparisons between cycle counting procedures are available for low-temperature high-cycle fatigue but not for high-temperature low-cycle dwell-fatigue applications. This work presents an extensive comparison between different multiaxial cycle counting procedures potentially suitable for high-temperature low-cycle dwell-fatigue applications. Furthermore, how to conservatively assemble design transients to construct a loading history is also an open question. This work also investigates the uncertainty related to the loading sequence. The results guide the selection of the most appropriate cycle counting procedure, strain range metric, and cycle distribution for ASME Section III, Division 5 applications.

Behaviour of the PFC tiles on the ITER divertor under critical loading conditions

2003 ◽  
Vol 66-68 ◽  
pp. 329-334 ◽  
Author(s):  
Elio D'Agata ◽  
S Grigoriev ◽  
G Federici ◽  
C Ibbott ◽  
A Makhankov ◽  
...  
Keyword(s):  
Loading Conditions ◽  
Critical Loading
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