Mts Fracture Template User Manual download pdf (Page 40)

may occur if the number of valid points is less than the two times the polynomial fit number plus 1. The

number of valid points is used to calculate the Apparent Delta-K Threshold. Invalid data points are not

used in calculations.

The Apparent Threshold calculation can fail:

• The da/DN-Delta K data is not available.

• The Least Square Fit limits are outside the range of the da/dN-Delta K data points.

• The Least Square Fit limits range is a number of valid da/dN-Delta K data points less than two times

the polynomial fit number plus 1.

Crack Length, Min/Max K, Load by Cycles Table

The Crack Length, Min/Max K, Load by Cycles table provides values for the cycles in the FCG Cycle Array

column. Additional default columns are:

• FCG Crack Size Array

• FCG K Maximum

• FCG K Minimum

• FCG P Max Array

• FCG P Min Array

• FCG COD Voltage Active Array

• FCG Crack Voltage Reference Array

Charts

The charts provide visual indicators of the crack growth rate and the forces that affect the rate.

• The da/dN vs. Delta K chart characterizes the specimen material’s resistance to stable crack extension

under cyclic loading.

• The Load vs. Cycle chart indicates the load range between the minimum and maximum values during

the last or other specified cycle.

• The Crack Opening Displacement vs. Cycle chart indicates the minimum and maximum crack opening

displacement during the last or other specified cycle.

• The Crack Size vs. Cycles chart indicates the crack growth during a number of cycles.

• The K vs. Cycles chart indicates the stress intensity factor, K, between its minimum and maximum

amount during a number of cycles.

• The Delta K vs. Array chart indicates the FCG Delta K Applied Array versus the FCG Crack Size Array.

Analyze the Test Runs

Each test that you create from an MTS template contains a default analysis definition that can be used to

analyze the test run in either the Fatigue Analyzer or Fracture Analyzer application.

To analyze the test runs, use one of the following methods to open the test in one of the Analyzer

applications:

40 | MTS TestSuite

Fatigue Crack Growth (FCG) Template

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 91 92

No comments

Mts Fracture Template User Manual Page 40