**H-Drill** - Hole-Drilling Residual Stress Calculation Program

**H-DRILL** is a specialized computer software for doing the stress calculations for
the popular hole-drilling method for measuring residual stresses.

**New version v.4.00 (2021):**^{ } Features include:

- Computes residual stresses according to ASTM E837-20
- Works with blind or through holes
- Works with finite thickness specimens
- Can use seven common hole-drilling rosettes
- Handles inch or metric units
- Does extensive data error checking
- Not restricted to particular hole depths
- Integral Method calculations for non-uniform stresses
- Uses regularization to stabilize stress solutions
- Estimates ranges of stresses for given data uncertainties
- Displays results in graphical and numerical formats
- Non-directional and fixed principal direction stress calculations
- Power Series calculations for linearly varying stresses
- Uniform stress calculations, useful to indicate stress magnitude
- Detailed instruction manual and answers to FAQ