public virtual double CalculateShear(double distanceFromLoadStartPosition)
 => ShearResult?.GetValue(distanceFromLoadStartPosition) ?? 0;
        public void ShearLoadResults_GetValueForShearForceTest_InsideLoadLength_Success()
        {
            var result = _shearResult.GetValue(distanceFromLoadStartPosition: 2);

            Assert.That(result, Is.EqualTo(2.666667).Within(0.000001));
        }