Mts Fracture Template User Manual download pdf (Page 81)

DescriptionParameter

Specify the stress intensity (K) value to use

in the load calculation.

Stress Intensity K

Calculate Stress Intensity K

Stress Intensity K Parameters

DescriptionParameter

Specify the crack size value to use in the

stress intensity (K) calculation.

Crack Size

Specify the load value to use in the stress

intensity (K) calculation.

Load

Run the Test

Setpoint/Span Times for Delta-K Control

MTS-supplied fracture test templates calculate setpoint and span values for those portions of a fracture

test that use Delta-K control. For example, the fracture test templates use Delta-K control to pre-crack the

specimen, and the Fatigue Crack Growth template can optionally run in Delta-K control mode.

When a fracture test template uses Delta-K control, it calculates and sends out setpoint and span values

for Delta-K control at a rate of every 1.0 second to the Series 793 Station Manager application. However,

the Station Manager application has default settings for Setpoint/Span Times of 2.0 seconds, which is the

time used to ramp the span and setpoint values. When the Setpoint/Span Times in the Station Manager

application are slower than the setpoint and span update rate in the fracture test template, the controller

may not complete the ramp to a command before the template sends out new span and setpoint corrections

for Delta-K control.

Before running a test with an MTS fracture test template, make sure in the Station Manager application

that the Tools > Channel Options > Command Options > Setpoint/Span Times are set to approximately

0.5 seconds for both Setpoint and Span.

MTS TestSuite | 81

Run the CTOD Fracture Toughness Test

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Mts Fracture Template User Manual Page 81