Structural Engineering & Statics
where the load goes
Concept

Stress concentration — where it appears

3 essays name this object, across one field. What follows is each of them, and the objects they name alongside it.
501001502000100200300400500600crack length, mmstress at failure, N/mm²275 N/mm² crosses at 33.5 mm460 N/mm² crosses at 12.0 mmfracture: the crack decides

The flaw that sets the strength

A member with a crack twenty millimetres long fails at its yield stress. Make the steel stronger and the crack that does it gets shorter, so the same flaw that was harmless in the weaker grade decides the stronger one.

materials · fracture pulled at 100 N/mm², left and right300-100 — compressionhoop stress, tinted3.0× at the edgewithin 5% by 3.5 radiithe applied stressdistance from the centre, in hole radii12345

The hole that multiplies the stress by three

The stress at the side of a hole is three times the applied stress whatever the hole's size, and at the top and bottom of the same hole it is minus one times it — compression in a plate that nothing is pushing.

materials · stress concentration 10⁴10⁵10⁶10⁷10⁸2050100200500cycles to failurestress range, N/mm²category 160category 90category 366.8e+74.3e+62.7e+5working range 70 N/mm² — the lives are marked

The load that never came near failing anything

A detail survives sixty-eight million cycles at a stress range that another detail in the same steel survives two hundred and seventy thousand of. The two lie a factor of two hundred and fifty apart, and the material is not on the plot anywhere.

materials · fatigue

Named alongside it

The objects these essays reach for when they reach for this one.

DuctilityFatigueFractureBrittle fractureCrack growthCritical crackDetail categoryElasticityEndurance limitFracture toughnessGriffithInspection

All concepts