Reciprocity in elastodynamics

Reciprocity relations have guided engineers and mathematicians for more than a century, revealing hidden links between physical situations and suggesting new ways to set up problems. Jan Achenbach, a mechanics specialist with an international reputation, applies this principle to the task of determining wave fields.

The ideas carry over to any field where waves move through solids: ultrasonic medical imaging, non-destructive testing of materials, acoustic microscopy, seismology, exploration geophysics and structural acoustics.