v3.2.0

Hybrid Steady-State Evaluation, Weak-Layer Split & Analysis Refactor

This release reworks steady-state PST evaluation, splits weak-layer modeling from slab layers, and reorganizes the analysis package. Key improvements include:

• Hybrid Steady-State Evaluation: Rewrote evaluate_SteadyState as a hybrid of independent critical-cut (tensile ease) and tip-contact / touchdown (ERR) PST configurations, with orientation winners chosen separately for each leg.
• Analysis Package Split: Extracted steady_state.py, coupled_criterion.py, and envelopes.py from CriteriaEvaluator, keeping evaluate_SteadyState as a thin facade.
• WeakLayer Component: Split WeakLayer into weac.components.weak_layer, leaving slab layers in Layer.
• Schöttner E(ρ) Elasticity: Derive weak-layer Young’s modulus from the Schöttner FC&DH density law (E_method="schottner_fc_dh"); lowered weak-layer preset densities to 100/150/200 kg/m³ so named presets stay within the Schöttner ≤250 kg/m³ range.
• Jamieson & Johnson Tensile Strength: Added tensile_strength_method="jamieson_johnson" (now the default) for slab tensile strength.
• Coupled-Criterion & Rasterization Refinements: Denser sampling near segment boundaries; improved CC search (damping, max iterations, reuse of min-force / x-coords).
• Surface-Load Stress Fix: Pointwise stress evaluation now passes surface_load (qs) so CC envelope root-finding agrees with rasterize_solution when surface_load != 0.

⚠️ Breaking changes

• CriteriaEvaluator.evaluate_SteadyState inputs/outputs differ from the previous flat result shape. Tensile and ERR now live under nested blocks (SteadyStateResult.tensile / .err).

🛠️ Code Maintenance

• Test Suite Migration: Migrated from unittest to pytest (CI + pyproject.toml); removed the legacy test runner.
• Version Bump: Formalized the transition to v3.2.0 across project metadata (pyproject.toml, CITATION.cff, and uv.lock).
• Linting: Applied ruff formatting across the analysis and component modules.

🧪 Testing

Added dedicated coverage for hybrid steady-state / critical-cut–touchdown workflows, denser boundary rasterization, Jamieson–Johnson tensile strength, and nonzero surface-load stress consistency.

📦 Pull Requests Included

• PR #54: Feat/Split WL and Layer + Feat/Add Schöttner E(ρ) elasticity + Chore/Test Suite to Pytest
• PR #56: Feat/hybrid steady-state evaluation and analysis package split (v3.2.0)
• PR #55: Fix/pass surface_load in pointwise stress evaluation

Full Changelog: v3.1.9...v3.2.0

v3.1.9

What's Changed

• Version/bump by @pillowbeast in #53

Full Changelog: v3.1.8...v3.1.9

v3.1.8

What's Changed

• Enhance slab tensile criterion logic and update tests by @pillowbeast in #51
• Minor/fixes by @pillowbeast in #52

Full Changelog: v3.1.7...v3.1.8

v3.1.7

What's Changed

Extract Sigma & Tau Max Values for history of iterations in Coupled Criterion Evaluation.

• Feat/sigma-tau-extraction by @pillowbeast in #50

Full Changelog: v3.1.6...v3.1.7

v3.1.6

What's Changed

• Snowpylot-bump by @pillowbeast in #49

Full Changelog: v3.1.5...v3.1.6

v3.1.5

CAAML Parser Update &

This update refines the snow profile parsing logic and enhances the physical accuracy of the slab tensile criterion. Key improvements include:

1. Slab Criterion Enhancements: Introduced a configurable low-density threshold and updated the tensile criterion logic to better represent low-density slab behavior.
2. Slope-Normal CAAML Transformation: Enhanced parsing functionality to automatically transform CAAML data to slope-normal coordinates and removed redundant fracture energy ($G_c$) calculations.
3. SnowPylot: Bump version so that SLF CAAML also work.
4. Parser Refactoring: Cleaned up redundant functions and standardized internal naming conventions for better maintainability.

🛠️ Code Maintenance

1. Dependency Update: Updated snowpylot dependencies and clarified test skip messaging.
2. Version Bump: Formalized the transition to v3.1.5 across project metadata (pyproject.toml, CITATION.cff, and uv.lock).
3. Linting: Applied ruff formatting across the snowpilot_parser.py module.

🧪 Testing
Implemented a dedicated test suite for the Slab Tensile Criterion to validate the new low-density threshold logic and ensure physical consistency across varying snowpack configurations.

📦 Pull Requests Included
PR #48: Dep/caaml-parser-update (Includes Slab Tensile Criterion updates and SnowPilot parsing enhancements).Full Changelog: v3.1.4...v3.1.5

v3.1.4

Fixes to Slab Failure Criterion & Weak Layer Presets

This update fixes slab failure criterion calculations and introduces standardized presets for quicker model setup. Key improvements include:

• Slab Criterion Fix: Bug Fix + Finer resolution ($dz=1$ instead of $dz=5$) for more accurate tensile criterion evaluation.
• Weak Layer Presets: Added a library of named presets (e.g., VERY_WEAK_LAYER, WEAK_LAYER) and a factory helper for easier instantiation.
• Strict Config Validation: Implemented model validators to ensure touchdown=True is only permitted when using the classic backend, preventing invalid simulation states.

🛠️ Code Maintenance

• Dependency Update: Bumped ipykernel minimum version for better environment compatibility.
• Refactored Tests: Standardized force decomposition tests to explicitly include the theta parameter.

🧪 Testing
Expanded regression testing for the SteadyState module and added comprehensive validation tests to ensure the new configuration constraints and backend logic are enforced at runtime.

📦 Pull Requests Included
PR #45: Bugfix slab criterion + Weak Layer Presets + Regression Test Steady State.

Full Changelog: v3.1.3...v3.1.4

v3.1.3

What's Changed

🚀 Feature: Force Touchdown Mode

• Add forced touchdown mode to prevent floating-point precision issues by @pillowbeast in #41

Full Changelog: v3.1.2...v3.1.3

v3.1.2

Update to Steady State Evaluation

🚀 Configurable Touchdown Modes
You can now define specific steady-state behaviors for touchdown. New supported modes include:

• Free-hanging: Modeling the slab without external contact.
• Point contact: Initializing contact at a single specific point.
• In-contact (Default): Full contact state evaluation.

🛠️ Code Maintenance: Added internal documentation (TODOs) for future layer-related optimizations.

🧪 Testing
Expanded the test suite to include validation for all new touchdown mode configurations, ensuring stability across hanging, contact, and lying-down states.

📦 Pull Requests Included
PR #40: New states for steady state.

Full Changelog: v3.1.1...v3.1.2

v3.1.1

What's Changed

• Add slab tensile criterion to stress analysis + Fix #37 & more by @pillowbeast in #38

Full Changelog: v3.1.0...v3.1.1