Dynamic Fracture Mechanics of Brittle and Quasi-Brittle Materials

Dynamic fracture mechanics investigates the rapid propagation of cracks in materials subjected to high loading rates. In truly brittle solids, such as glass or ceramics, failure occurs suddenly with minimal inelastic deformation, whereas quasi-brittle materials—including concrete, natural stone and certain advanced ceramics—exhibit distributed microcracking that precedes macroscopic crack growth. Central to this discipline are measures of the crack-tip driving force, notably the dynamic stress intensity factor and the dynamic energy release rate, which account for inertial and wave-propagation effects. Recent advances integrate high-speed optical diagnostics, refined analytical criteria and sophisticated computational strategies to capture crack branching, arrest phenomena and size-dependent strength. Such developments are vital for enhancing resilience in civil infrastructure, geotechnical works and protective systems, and for tailoring novel materials with superior dynamic toughness.

Research from Nature Portfolio

Recent studies have harnessed discrete element frameworks to explore fracture scaling in quasi-brittle solids. One investigation employed a lattice discrete element method to simulate microcrack nucleation and coalescence over a range of specimen sizes, revealing that crack cloud interactions govern size effects according to fractal dimensions. The findings bridge continuum-based size-effect laws and microscopic randomness, validating discrete models as robust tools for nonlinear analysis of structures composed of concrete, ceramics and natural stones under dynamic loading.

Dynamic Fracture Mechanics of Brittle and Quasi-Brittle Materials publication trend

The graph below shows the total number of articles in dynamic fracture mechanics of brittle and quasi-brittle materials across all publications each year (not limited to Nature Index journals).

Technical terms

Brittle material: A solid exhibiting minimal plastic deformation prior to abrupt fracture under applied stress.

Quasi-brittle material: A material in which dispersed microcracking and distributed damage precede macroscopic failure, leading to size-dependent strength and enhanced energy dissipation.

Stress intensity factor: A parameter quantifying the magnitude of the stress field near a crack tip that drives crack initiation and propagation.

Energy release rate: The rate at which elastic energy is liberated per unit area of crack extension under dynamic or static conditions.

Discrete element method: A numerical technique modelling materials as assemblies of interacting particles or elements, capable of capturing crack nucleation, growth and coalescence without assuming continuum behaviour.

References

1. A study by the lattice discrete element method for exploring the fractal nature of scale effects. Scientific Reports (2022).
2. Analytical Model with Independent Control of Load–Displacement Curve Branches for Brittle Material Strength Prediction Using Pre-Peak Test Loads. Symmetry (2022).
3. Dynamic Mechanical Characteristics of Horseshoe Tunnel Subjected to Blasting and Confining Pressure. Applied Sciences (2023).