Johnson-Holmquist
Brittle Damage in Abaqus | Brittle Cracking Abaqus​
Brittle materials, such as ceramics, glass, and concrete, break or fracture easily under stress without extensive deformation. Unlike ductile materials, brittle materials snap suddenly, lacking the flexibility to rearrange their atomic structure under strain. These materials have low tensile strength but strong compressive resistance, making them vulnerable to brittle cracking Abaqus simulations when stretched or pulled.
Understanding brittle material damage is crucial in safety-critical fields like civil engineering, aerospace, and manufacturing, where unexpected fractures can lead to catastrophic failures. Simulations help engineers predict when and how brittle materials may break, guiding safer design choices. Brittle cracking Abaqus can be modeled using various methods, including the Johnson-Holmquist (JH) model, XFEM, and energy-based approaches, each suited to different types of loading conditions.
For dynamic, high-strain applications like impacts, the JH model is effective, particularly in Abaqus/Explicit with specific damage parameters. For general crack modeling, XFEM is versatile, allowing cracks to form naturally without predefined paths. The energy-based method is useful for slow-loading scenarios, defining an energy threshold for fracture initiation. Each method requires careful input of material properties, mesh refinement, and load conditions to reveal potential failure points and improve material performance in real applications.
Johnson-Holmquist damage model in Abaqus
The Johnson-Holmquist damage model is used in solid mechanics to simulate the mechanical behavior of damaged brittle materials over a range of strain rates, including ceramics, rocks, and concrete. These materials typically exhibit gradual degradation under load due to the development of microfractures and typically have high compressive strength but low tensile strength. In this package, there are 13 practical examples to teach you how to use this damage model. The workshops are categorized into Ceramic materials, concrete, glass materials, and others.
Low-Velocity Impact simulation
Low-velocity impact refers to the collision between objects at relatively low speeds. While the impact energy may be lower compared to high-speed impacts, low-velocity impacts can still cause significant damage and deformation. Assessing the effects of low-velocity impact is crucial for various industries to ensure the structural integrity, safety, and performance of their products. For example, in the automotive industry, understanding the response of vehicles to low-velocity impacts is essential for designing crashworthy structures and improving occupant safety. In aerospace, assessing the impact resistance of aircraft components, such as fuselage panels or wings, helps ensure their ability to withstand ground handling incidents or bird strikes. In this package, you will learn how to do low-velocity impact simulations with several practical examples.
A tunnel is an underground or underwater passage for transportation, utility lines, or water pipelines. Tunnels are critical infrastructure, and their safety and reliability are essential for ensuring public safety and the smooth functioning of society. Tunnel simulation involves using computer models to predict the behaviour of tunnels under different types of loading conditions, such as earthquakes, floods, or explosions. These simulations can help engineers and policymakers assess the safety and reliability of tunnels, identify potential failure modes, and develop strategies to mitigate risks. By using advanced simulation techniques, engineers can better understand the complex behavior of tunnels and design more effective and durable structures. Tunnel simulation is an essential tool for ensuring the safety and resilience of tunnels and the infrastructure they support. Some workshops are presented in this package to teach you how to simulate and analyze tunnels in Abaqus; two of these workshops are Damage analysis of an underground box tunnel subjected to surface explosion and Tunnel dynamic analysis subjected to internal blast loading using CEL method.
Eulerian Abaqus and CEL modeling
The Eulerian method is a numerical technique used to analyze fluid mechanics problems. In this approach, the fluid is treated as a fixed grid, where the nodes remain stationary while the fluid flows through them. The Eulerian Abaqus method can be used to analyze fluid-structure interactions, such as fluid impact on structures or the behavior of fluids in containers. To use the Eulerian method in Abaqus, the desired geometry must first be meshed using Eulerian elements. The material behavior of the fluid is then defined using appropriate equations of state. Finally, the boundary conditions and loading are applied, and the system is solved using the appropriate numerical method, such as the finite element method. This package will teach you how to use this method and various practical examples. Also, this package covers several practical examples in Abaqus CEL method.
Cold spray & Shot peening simulation in Abaqus
Cold spray is a process used to deposit materials onto a substrate by accelerating fine powder particles to high velocities using compressed gas. Upon impact with the substrate, the particles undergo rapid plastic deformation, disrupting surface oxide films and promoting bonding between metal surfaces. Unlike thermal spray processes, cold spray avoids thermal degradation and partial oxidation of the coating material, resulting in coatings with low porosity and oxygen content. The process is highly efficient, with deposition efficiencies often exceeding 90%. Shot peening is a metal treatment process that involves bombarding a surface with small, round metallic (usually steel), ceramic, or glass beads at high velocity. This process creates small indentations on the surface, which in turn introduces compressive residual stress into the material. These two processes are different and use for separate purposes but their simulations are the same.
Cold spray is particularly important in applications where thermal degradation or oxidation of the coating material is a concern or where the coating is required to be thick and free from defects. In this package, you will learn how to simulate this process with different methods, such as ALE and SPH, with different materials. For example, Cold spray simulation of steel particles impacts on the Inconel target using ALE method.
Masonry wall Abaqus simulation
The term masonry can refer to the construction materials brick, stone, etc. An assembly of masonry units, such as concrete blocks, burnt clay bricks, sundried bricks, stone bricks, and natural stones, linked together with mortar or grout is referred to as a masonry wall. It is important to know how these structures behave under different loading conditions, such as explosion, tension, earthquake, etc. to have the best design. In this package, you’ll learn all of that in four workshops: Behavior of a masonry wall under a couple Eulerian-Lagrangian explosion, micro modeling of a masonry wall, modeling of reinforced bricks masonry beams using GFRP reinforcement, earthquake simulation over masonry wall.
A mathematical model called the Mohr-Coulomb theory describes how brittle materials, such as concrete or rubble piles, react to both shear stress and normal stress. This rule is followed by the majority of traditional engineered materials in at least some of their shear failure envelope. In this package, you will learn how to use this theory in four practical examples: Analysis of surface explosion damage to an underground box tube in ABAQUS, dynamic analysis of a tunnel in soil subjected to internal blast loading, An internal explosion-related numerical simulation of the behavior of a pipeline's damage mechanics, and for cases utilizing crashworthiness, simulate an Eulerian method to soil impact analysis.
Foam is a type of expanded plastic and rubber produced by forcing gas bubbles into a polymer material. It is a permeating, lightweight material. Along with corrugated packaging, foam fabric can protect goods during transportation. Foams, a novel family of ultra-light materials, have the capacity to undergo significant deformation at practically constant plateau stress, which allows them to absorb a significant amount of kinetic energy. In this tutorial package, you will learn how to analyze sandwich panels with an interior layer of foam, Foam-Filled Aluminum Tubes subjected to compressive loads, simulation of a reinforced foamed concrete beam, concrete-titanium foam panel explosion, etc. All of these cool practical examples with their complete tutorial videos are in this package which you can read their description below.
