RMCRC Project Update FULL FIELD 3D STRESS & FATIGUE DAMAGE MEASUREMENT Professor Rhys Jones Monash...
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Transcript of RMCRC Project Update FULL FIELD 3D STRESS & FATIGUE DAMAGE MEASUREMENT Professor Rhys Jones Monash...
![Page 1: RMCRC Project Update FULL FIELD 3D STRESS & FATIGUE DAMAGE MEASUREMENT Professor Rhys Jones Monash Centre of Expertise Structural Mechanics (CoE-SM) Email:](https://reader037.fdocuments.in/reader037/viewer/2022110405/56649ee45503460f94bf35b4/html5/thumbnails/1.jpg)
RMCRC Project Update
FULL FIELD 3D STRESS &
FATIGUE DAMAGE MEASUREMENT
Professor Rhys Jones
Monash Centre of Expertise Structural Mechanics (CoE-SM)
Email: [email protected]/08/2015
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A major advantage of this facility is the ability to:
• Rapidly validate finite element designs/analysis
• Rapidly rank and optimise competing designs without the need to perform extensive full scale fatigue testing.
• Assess fatigue performance without the need for a time consuming fatigue test and
• The entire test/evaluation will take less than 1 day
• Designs AND Fitment For Purpose Can be Validated In Unique Purpose Built Full Scale Test Facility
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A Unique Full Scale Full Field 3D Stress Measurement Facility
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Uses Non Contact Infra-Red Stress Analysis To Validate Measure The Full Field 3D Stresses And Fatigue
Performance Under Load
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Background: The change in temperature of a body under load is proportional to the change in stress
DT= -Km.T. Ds
Km = / .a r Cp
=a Linear expansion
= r Density
Cp= Specific heat
= Ds Change in the sum of the principal stressesT is the absolute temperature in KKm is the Thermo-elastic coefficient of material MPa-1
Kelvin’s Law
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Thus by measuring the surface temperatures during loading you can determine
a) The stress distribution over the entire structure
b) The fatigue hot spots over the entire structure
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Example Stresses and Fatigue Damage in a Rail Sleeper
Australian Standard AS 1085.17—2003 calls for the following test
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FIGURE F2 RAIL SEAT REPEATED LOAD TEST RIG ASSEMBLY
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A rail seat assembly repeated load test at IRT in the Department of Mechanical and Aerospace Engineering at Monash University
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Ability to isolate and quantify the highest stressed region
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Ability to locate and quantify the fatigue critical regions without the need for exhaustive and time consuming fatigue tests