1. RMCRC Project Update FULL FIELD 3D STRESS & FATIGUE DAMAGE MEASUREMENT Professor Rhys Jones Monash Centre of Expertise Structural Mechanics (CoE-SM) Email: rhys.jones@monash.edu 20/08/2015

2. 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

3. A Unique Full Scale Full Field 3D Stress Measurement Facility

4. Uses Non Contact Infra-Red Stress Analysis To Validate Measure The Full Field 3D Stresses And Fatigue Performance Under Load

5. Background: The change in temperature of a body under load is proportional to the change in stress  T= -K m.T.  K m  =  Cp  Linear expansion  Density C p = Specific heat  Change in the sum of the principal stresses T is the absolute temperature in K K m is the Thermo-elastic coefficient of material MPa -1 Kelvin’s Law

6. 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

7. Example Stresses and Fatigue Damage in a Rail Sleeper Australian Standard AS 1085.17—2003 calls for the following test

8. FIGURE F2 RAIL SEAT REPEATED LOAD TEST RIG ASSEMBLY

9. A rail seat assembly repeated load test at IRT in the Department of Mechanical and Aerospace Engineering at Monash University

10. Ability to isolate and quantify the highest stressed region

11. Ability to locate and quantify the fatigue critical regions without the need for exhaustive and time consuming fatigue tests