StressOne

Mechanics of materials, worked interactively. Not a formula lookup: every screen is a live figure that redraws as you change what feeds it. WHAT IT COVERS • Stress and strain at a point — the stress circle, the rotating element, absolute maximum shear, the generalised elastic relations • Beam diagrams — shear and bending moment for simple, overhanging, cantilever, propped and fixed-end beams, with the peaks located • Section builder — twelve primitives, added or cut away, with every property the rest of the app needs • Beam deflection — by integration, by standard case, and by superposition, with all three agreeing • Bending stress — the flexure formula, unsymmetric bending, flitched sections, and the core of the section • Shear stress — the distribution through the depth, the jump at every width step, and fastener spacing • Combined loading — five actions at once, and a scan for the point that actually governs • Failure criteria — five envelopes on one plane, with your state as a moving point • Columns — the Euler curve, the yield cut-off, and the parabola that joins them • Torsion — circular, non-circular, thin-walled closed and open, and what a slit costs • Strain rosette — three readings in, a full strain state out, checked by substitution • Reinforced concrete — the cracked neutral axis found two independent ways, shown agreeing • Thick walls and rotating discs — pressure through a thick cylinder or a spinning disc, bore or no bore • Curved beams — the neutral axis is not the centroid, with the straight-beam error printed beside it • Helical springs — plain torsion against Wahl's correction, so you can see what the correction costs • Plastic bending — past first yield, and the residual stress a bar keeps after it is let go • Riveted and welded joints — three ways a joint can fail, with the weakest one named • Axial and thermal — bars, temperature, misfit, impact, and thin-walled vessels WHY THE ANSWERS CAN BE CHECKED Results are verified against public-domain reference solutions — NASA Astronautic Structures Manual, the Air Force Stress Analysis Manual, and MIL-HDBK-5J — and against a twenty-digit independent recomputation. Identities that must always hold are swept over thousands of parameter combinations rather than checked at a few points. A theory manual, generated from the same specification the app carries, states every assumption and every limit of applicability. WHERE IT REFUSES TO GUESS Some questions have two defensible answers. Which side of a width step. Which axis a column buckles about. Which point on a section governs under combined loading. This app shows both, with the reason beside each, and never picks one quietly — because the wrong pick is not a different answer, it is an unsafe one. DESIGNED FOR STUDY AND CHECKING Works entirely offline. No account, no network, no data collected of any kind.