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# What does PDF stand for?

## PDF stands for Partitioning of Deformation

75 } \right] \] It is easy to see that the rotation matrix corresponds to a 30° rotation. The matrix product is commonly written as ${\bf F} = {\bf R} \cdot {\bf U}$ where $${\bf R}$$ is the rotation matrix, and $${\bf U}$$ is the right stretch tensor that is responsible for all the problems in life: stress, strain, fatigue, cracks, fracture, etc. Note that the process is read from right to left, not left to right. $${\bf U}$$ is applied first, then $${\bf R}$$. This partitioning of the deformation.