Material Ratcheting

Progressive net inelastic strain or deformation over repeated load cycles because the material response does not return to its previous cycle state.

Version

v2 · 2026-10-03 · History

Domain-specific #

13419

Aliases

Plastic Ratcheting, Cyclic Ratcheting, Cyclic Creep

Core Idea

Material ratcheting is continuing net inelastic strain or deformation across repeated mechanical or thermal load cycles. At a comparable phase of successive cycles, the material state drifts because part of the strain is unrecovered. A particular mean stress, nonlinear hardening rule, damage endpoint or Bree diagram may help explain one case, but none is necessary to identify the phenomenon.[^{ref-4eabef913773][}ref-ccddeca6ef24][^ref-4dca8b7b601d]

Scope of Application

Bree's pressurized thin tube under cycling thermal stress distinguishes ratchetting from plastic cycling and treats both work-hardening and non-work-hardening materials. In Jiang and Sehitoglu's rolling-contact simulation, rail-surface plastic shear accumulates over wheel passages; the modeled direction can change across wheel-load blocks. Zircaloy-2 cyclic tests vary mean stress, amplitude and rate, showing those parameters affect accumulation rather than define it.[^{ref-4eabef913773][}ref-ccddeca6ef24][^ref-4dca8b7b601d]

Clarity

Yielding once is not enough. Nor is a closed plastic hysteresis loop, which can dissipate energy without net comparable-phase strain drift. If the residual state stabilizes after early cycles, the later response is shakedown or stable cycling rather than ongoing ratcheting. Failure is a possible later consequence, not a required proof of ratcheting.[^{ref-4eabef913773][}ref-1e18efd93a01]

Manages Complexity

The diagnostic compresses many material and load details into a response-history question: does unrecovered strain continue to increase or shift from cycle to cycle? Bree-type maps are useful within their pressure/thermal assumptions, while rolling contact requires its own traction and history model. The abstraction separates the physical response from one favored constitutive model.[^{ref-4eabef913773][}ref-ccddeca6ef24]

Abstract Reasoning

Measure strain at the same phase of repeated loads. If subsequent states approach a fixed value, the response is closing or shaking down; if net inelastic increments persist, material ratcheting is present over the observed interval. Rate and direction still depend on material law and load path, and can change when the history changes.[^{ref-ccddeca6ef24][}ref-1e18efd93a01]

Knowledge Transfer

The residual-drift test transfers literally between pressure-vessel hoop deformation and rail-surface shear, but the load map, stress components and predicted rates do not. Live Ratchet Effect offers an analogy of asymmetric advancement, yet its current lock-and-driver definition is not established as a necessary genus of every material case; this draft is staged unparented pending graph review.[^{ref-4eabef913773][}ref-ccddeca6ef24]

[^ref-4eabef913773]: J. Bree, “Elastic-plastic behaviour of thin tubes subjected to internal pressure and intermittent high-heat fluxes with application to fast-nuclear-reactor fuel elements”, Journal of Strain Analysis for Engineering Design 2(3) (1967), 226–238, publisher abstract. [^ref-ccddeca6ef24]: Yanyao Jiang and Huseyin Sehitoglu, “Rolling contact stress analysis with the application of a new plasticity model”, Wear 191(1–2) (1996), 35–44, indexed publisher abstract; author metadata corroborated by Illinois research profile. [^ref-4dca8b7b601d]: R. S. Rajpurohit, N. C. Santhi Srinivas, and Vakil Singh, “Ratcheting Strain Accumulation Due to Asymmetric Cyclic Loading of Zircaloy-2 at Room Temperature”, Procedia Structural Integrity 2 (2016), 2757–2763, DOI 10.1016/j.prostr.2016.06.344, publisher abstract. [^ref-1e18efd93a01]: R. A. W. Bradford and D. J. Tipping, “The ratchet–shakedown diagram for a thin pressurised pipe subject to additional axial load and cyclic secondary global bending”, International Journal of Pressure Vessels and Piping 134 (2015), 92–100, DOI 10.1016/j.ijpvp.2015.08.008, publisher abstract.

Neighborhood in Abstraction Space

Material Ratcheting sits in a sparse region of the domain-specific corpus (76^th percentile for distinctiveness): few abstractions share its structure, so a faithful description tends to retrieve it precisely.

Family — Structural & Geological Failure Mechanics (23 abstractions)

Nearest neighbors

• Basquin's Law — 0.85
• Dislocation Creep — 0.84
• Subsidence — 0.83
• Paris' Law — 0.83
• Objective Stress Rate — 0.82

Computed from structural-signature embeddings · 2026-10-08