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The representative curves of the applied stress versus the number of cycles for different metals are shown in Figure Q2. Analyze both metals in terms of fatigue properties. 500 (₂u 1045 steel

The representative curves of the applied stress versus the number of cycles for different metals are shown in Figure Q2. Analyze both metals in terms of fatigue properties. 500 (₂u 1045 steel

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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The graph in Figure Q2 displays the representative curves of applied stress amplitude versus the number of cycles for two different metals: 1045 steel and 2014-T6 aluminium. The x-axis represents the number of cycles (\(N_f\)), ranging from \(10^3\) to \(10^9\), on a logarithmic scale. The y-axis indicates the stress amplitude measured in meganautons per square meter (MN/m²). ### Description of the Graph: - **1045 Steel Curve**: The upper curve represents 1045 steel. It shows a gradual decrease in stress amplitude as the number of cycles increases. Beyond \(10^6\) cycles, the curve flattens out, indicating a region where the stress amplitude remains relatively constant despite the increasing number of cycles. This behavior suggests a high endurance limit for steel. - **2014-T6 Aluminium Curve**: The lower curve represents 2014-T6 aluminium. It also shows a decreasing trend in stress amplitude with increasing cycles. However, this curve declines more steeply than the steel. After \(10^6\) cycles, the slope becomes less steep, implying a lower endurance limit compared to steel. ### Analysis: - **Fatigue Properties**: The curves illustrate different fatigue behaviors between the two metals. 1045 steel has superior fatigue resistance, maintaining higher stress amplitudes over more cycles compared to 2014-T6 aluminium. Figure Q2 effectively highlights the differences in endurance and fatigue limits between two common engineering materials used in structural applications.
Transcribed Image Text:The graph in Figure Q2 displays the representative curves of applied stress amplitude versus the number of cycles for two different metals: 1045 steel and 2014-T6 aluminium. The x-axis represents the number of cycles (\(N_f\)), ranging from \(10^3\) to \(10^9\), on a logarithmic scale. The y-axis indicates the stress amplitude measured in meganautons per square meter (MN/m²). ### Description of the Graph: - **1045 Steel Curve**: The upper curve represents 1045 steel. It shows a gradual decrease in stress amplitude as the number of cycles increases. Beyond \(10^6\) cycles, the curve flattens out, indicating a region where the stress amplitude remains relatively constant despite the increasing number of cycles. This behavior suggests a high endurance limit for steel. - **2014-T6 Aluminium Curve**: The lower curve represents 2014-T6 aluminium. It also shows a decreasing trend in stress amplitude with increasing cycles. However, this curve declines more steeply than the steel. After \(10^6\) cycles, the slope becomes less steep, implying a lower endurance limit compared to steel. ### Analysis: - **Fatigue Properties**: The curves illustrate different fatigue behaviors between the two metals. 1045 steel has superior fatigue resistance, maintaining higher stress amplitudes over more cycles compared to 2014-T6 aluminium. Figure Q2 effectively highlights the differences in endurance and fatigue limits between two common engineering materials used in structural applications.
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