Stress at crack tip of a 2D cantilever beam under sinusoidal excitation

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Discussion Overview

The discussion centers on the stress analysis at the crack tip of a 2D cantilever beam subjected to sinusoidal excitation. Participants are exploring the appropriate stress criteria for assessing crack propagation, particularly whether to consider principal stress in the y-direction or another stress measure.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant seeks advice on which stress to consider for crack propagation at the crack tip, specifically questioning the relevance of principal stress in the y-direction.
  • Another participant asks for context regarding the inquiry, inquiring whether it pertains to material testing or academic work.
  • A participant identifies themselves as a graduate student, indicating that the topic is part of their research.
  • Another participant suggests that the question may be more appropriate for technical forums if it is graduate-level work and requests the original poster to share their reasoning.
  • One participant proposes that the principal stress in the y-direction might be the correct consideration for the analysis.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the appropriate stress measure for crack propagation, and multiple viewpoints regarding the analysis remain present.

Contextual Notes

The discussion lacks detailed mathematical analysis or specific definitions of stress types being considered, which may affect the clarity of the inquiry.

Rony shaha
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I need some information urgently. I am working on crack of a 2-D cantilever beam. One side of the beam is fixed. I am applying a sinusoidal time varying load on other end in Y-direction.Beam length and width are 100cm and 10cm respectively. crack is 05 cm in y-direction. I have attached data and drawing for my questions.

I want to know which stress should I follow for the crack propagation at crack tip. is it principle stress in y -direction or any other stress? Please give me some advice
 

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Rony shaha said:
I need some information urgently. I am working on crack of a 2-D cantilever beam. One side of the beam is fixed. I am applying a sinusoidal time varying load on other end in Y-direction.Beam length and width are 100cm and 10cm respectively. crack is 05 cm in y-direction. I have attached data and drawing for my questions.

I want to know which stress should I follow for the crack propagation at crack tip. is it principle stress in y -direction or any other stress? Please give me some advice

Welcome to the PF.

What is the context for your question? Are you working in a material testing lab, or is this for schoolwork?
 
I am Graduate student. This is my research topic.
 
Rony shaha said:
I am Graduate student. This is my research topic.

Okay, thanks. Normally schoolwork goes in the Homework Help forums, but for graduate-level questions, they can be posted in the technical forums as long as you show lots of your work. Can you post what you think the correct answer is and why?
 
I think the possible answer is principle stress in y-direction
 

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