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A compact tension specimen is tested according to ASTM standard E399. The load displacement curve is shown in the Figure below with PQ= 120 kN (Type 1 curve). The specimen dimensions are B=0.5 cm, W=10 cm, and “a” =5 cm. If the materials yield stress is 600 MPa are the conditions correct for a valid K1C measurement?

A compact tension specimen is tested according to ASTM standard E399. The load displacement curve is shown in the Figure below with PQ= 120 kN (Type 1 curve). The specimen dimensions are B=0.5 cm, W=10 cm, and “a” =5 cm. If the materials yield stress is 600 MPa are the conditions correct for a valid K1C measurement?

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A compact tension specimen is tested according to ASTM standard E399. The load
displacement curve is shown in the Figure below with PQ= 120 kN (Type 1 curve). The specimen
dimensions are B=0.5 cm, W=10 cm, and “a” =5 cm. If the materials yield stress is 600 MPa are
the conditions correct for a valid K1C measurement?
Please look up McEviley’s textbook on the thickness criterion for a valid fracture toughness value. 

 

The image depicts a graph comparing load versus displacement, featuring three types of loading behaviors labeled as Type I, Type II, and Type III. 1. **Axes**: - The vertical axis represents "Load." - The horizontal axis represents "Displacement." 2. **Type I**: - Shows a linear increase in load with displacement until it reaches a point where \( P_s = PQ \). - There is a marked point for "3% Secant." 3. **Type II**: - Demonstrates an increase in load followed by a small drop at \( P_s \), then a rise to reach \( P_{\text{max}} \) and slight decline. - It highlights the distinct points \( P_Q \) and \( P_s \). 4. **Type III**: - The load increases with displacement without any initial drop, reaching \( P_{\text{max}} \). It ends with a rapid drop afterward. - Here, \( P_{\text{max}} = PQ \), indicating a direct correlation between these two points. This diagram is useful for understanding different structural response behaviors under varying loads and displacement conditions.
Transcribed Image Text:The image depicts a graph comparing load versus displacement, featuring three types of loading behaviors labeled as Type I, Type II, and Type III. 1. **Axes**: - The vertical axis represents "Load." - The horizontal axis represents "Displacement." 2. **Type I**: - Shows a linear increase in load with displacement until it reaches a point where \( P_s = PQ \). - There is a marked point for "3% Secant." 3. **Type II**: - Demonstrates an increase in load followed by a small drop at \( P_s \), then a rise to reach \( P_{\text{max}} \) and slight decline. - It highlights the distinct points \( P_Q \) and \( P_s \). 4. **Type III**: - The load increases with displacement without any initial drop, reaching \( P_{\text{max}} \). It ends with a rapid drop afterward. - Here, \( P_{\text{max}} = PQ \), indicating a direct correlation between these two points. This diagram is useful for understanding different structural response behaviors under varying loads and displacement conditions.
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