The fracture behavior of a crack in a threaded bolt depends on the stress intensity factor (SIF). Available SIF solutions have approximated the threaded bolt as a circular groove, thus, the SIF predominantly corresponds to the opening mode, mode-I. As a thread in a bolt has a helix angle, the crack propagates under mixed mode conditions (opening, sliding and tearing), esp. when the crack sizes are small. This paper presents the results of SIF solutions for a part-through crack emanating from a Metric threaded bolt. A 3D finite element model with preexisting flaws was generated to calculate the SIF values along the crack front. Crack aspect ratios in the range of (0.2 < (a/c) < 1) and crack depth ratios in the range of (0.1 < (a/d) < 0.5) (where “a” is crack length, “c” is semi major axis of ellipse and “d” is minor diameter of the bolt) were considered along the crack plane for the SIF estimation. The SIF values at the midregion decreases with an increase in aspect ratio (a/c), and SIF increases when the crack depth ratio (a/d) increases in the midregion. Close to the free edges, higher SIF values was observed for crack depth and aspect ratios ranging between 0.2 and 0.6 compared to midregion. In the crack surface region, up to a crack depth ratio of 0.25, significant influence of mode-II and mode-III fracture was noted for shallow cracks (a/c < 0.2). Significant influence of mode-II and mode-III fracture was observed for semicircular cracks (a/c = 1) beyond the crack depth ratio of 0.3.
Skip Nav Destination
Article navigation
April 2013
Research-Article
Effect of Helix Angle on the Stress Intensity Factor of a Cracked Threaded Bolt
Raghu V. Prakash
Raghu V. Prakash
1
e-mail: raghuprakash@iitm.ac.in
Department of Mechanical Engineering,
Department of Mechanical Engineering,
Indian Institute of Technology Madras
,Chennai 600 036
, India
1Corresponding author.
Search for other works by this author on:
Raghu V. Prakash
e-mail: raghuprakash@iitm.ac.in
Department of Mechanical Engineering,
Department of Mechanical Engineering,
Indian Institute of Technology Madras
,Chennai 600 036
, India
1Corresponding author.
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the Journal of Pressure Vessel Technology. Manuscript received July 30, 2011; final manuscript received January 11, 2012; published online March 18, 2013. Assoc. Editor: Noel O'Dowd.
J. Pressure Vessel Technol. Apr 2013, 135(2): 021202 (12 pages)
Published Online: March 18, 2013
Article history
Received:
July 30, 2011
Revision Received:
January 11, 2012
Citation
Kumar, S. S., and Prakash, R. V. (March 18, 2013). "Effect of Helix Angle on the Stress Intensity Factor of a Cracked Threaded Bolt." ASME. J. Pressure Vessel Technol. April 2013; 135(2): 021202. https://doi.org/10.1115/1.4007290
Download citation file:
Get Email Alerts
Cited By
Surface Strain Measurement for Non-Intrusive Internal Pressure Evaluation of A Cannon
J. Pressure Vessel Technol
The Upper Bound of the Buckling Stress of Axially Compressed Carbon Steel Circular Cylindrical Shells
J. Pressure Vessel Technol (December 2024)
Crack Growth Prediction Based on Uncertain Parameters Using Ensemble Kalman Filter
J. Pressure Vessel Technol (December 2024)
Defect Detection of Polyethylene Gas Pipeline Based on Convolutional Neural Networks and Image Processing
J. Pressure Vessel Technol
Related Articles
Ultrasonic Technique for Experimental Evaluation of Structural Integrity
J. Test. Eval. (May,2001)
Enhanced Pseudo-Three-Dimensional Model for Multiple Hydraulic Fractures
J. Appl. Mech (January,2021)
Analysis of the Bimaterial Interface Cracks Based on Configurational Forces
J. Appl. Mech (October,2021)
Ice Adhesion Characterization Using Mode-I and Mode-II Fracture Configurations
J. Appl. Mech (December,2023)
Related Proceedings Papers
Related Chapters
Mode I Stress Intensity Factors for Point-Loaded Cylindrical Test Specimens with One or Two Radial Cracks
Fracture Mechanics: Fifteenth Symposium
Influence of Loading System on Crack Propagation and Arrest Behavior in a Double-Cantilever Beam Specimen
Fracture Mechanics Applied to Brittle Materials
The Fatigue Growth of Internal Delaminations Under Compressive Loading of Cross-Ply Composite Plates
Composite Materials: Fatigue and Fracture (Sixth Volume)