• DEMO: FEA analysis of an aircraft stiffened lug detail
  • How a “Single Corner Crack in Lug” solution compares with FEA results?
• LEARN: Strategies for efficiently meshing 3D fracture mechanics problems
  • Mixed meshing vs. all-tetrahedral meshing along 3D crack fronts
  • Automatically-generated vs. manually-input element layers around 3D crack fronts
  • No refinements vs. geometrically graded refinements at 3D crack tip intersections
  • 100% automesh vs. “seeding" an automesh with hand-meshed nodes/elements
• REVIEW: Sample 3D and plane strain fracture mechanics case studies
  • “Selected Stress Intensity Factor Cases”, DTD Handbook Section 11.3
• Summary & resources
  • SC v12.0 training options

• StressCheck’s FEA technology implementation for the modeling, meshing and analysis of arbitrarily shaped 3D crack geometries, with and without the local effects of multi-body contact.
• Strategies for automatic meshing of 3D cracks with high-aspect ratio, 3D-solid pentahedral and hexahedral elements to support high-quality SIF extractions at any location on the crack front.
• New StressCheck 12.0 method to support multi-body contact assembly meshing, auto-detection of contact regions, and automatic assignment of contact pairs for 3D solid bodies.

WEBINAR SUMMARY

WEBINAR HIGHLIGHTS

• Problem definition, scope and use of symmetry to reduce model size
• Importation of a parameter file (.par)
• Construction of 3D parametric solid bodies (boxes, cylinders, cones, etc.)
• Boolean union/subtraction operations between 3D solid bodies to define 3D splice joint parts
• Copy operations to duplicate child fastener bodies from a single parent fastener body
• Body-to-body imprints between all parts for optimization of contacting surfaces

• Creation of Parts for efficient bookkeeping and visualization
• Generation of the solid mixed meshes for each Part via Global, Boundary Layer and Thin Section automesh methods
• Creation of contact zones for Part regions expected to be in contact
• Definition and assignment of material properties to each Part
• Assignment of boundary conditions (loads and constraints) to each Part
• Assignment of contact pairs to allow gap and pressure computations between Part contact zones

• Linear multi-body contact solution setup and initiating the solver
• Evaluation of max contact pressure error, solve time and degrees of freedom solved (DOF)
• Plotting the deformation of the 3D splice joint assembly
• Plotting of von Mises stresses for each Part in the 3D splice joint assembly
• Unaveraged vs. averaged von Mises stresses for each plate Part
• Computing the stress resultants to ensure quality load transfer between Parts
• Summary and wrap-up

• Overview of recent features and enhancements already implemented in StressCheck Professional
• Demonstration of key features and enhancements available in StressCheck v11.1
• Overview of current development activities and future plans for StressCheck Professional
• Demonstration of key features and enhancements expected with the next release of StressCheck
• Open discussion and Q&A

• Compute the linear (coefficient of thermal conductivity for a reference temperature T=200 °F) and material nonlinear (coefficient of thermal conductivity is allowed to be temperature-dependent) temperature distributions via steady-state conduction heat transfer
• Apply the temperature distribution computed from the material nonlinear solution as a thermal load for all elements using a reference temperature of 0 °F
• Solve a linear elastic solution using the thermal load, symmetry/rigid body constraints, and temperature-dependent linear isotropic properties
• Extract the local stresses at the intersection of the fin and the pipes.

• Cooling of the external pipe surfaces is by convection via parameters "Hc" (convective film coefficient) and  "Tc"(convective temperature).
• The left pipe inside temperature is given by parameter "To", and the right pipe inside temperature is given by parameter "Tp".

• Thermal loading of the connecting pipes + fin is defined by importing the temperatures from the material nonlinear steady state conduction heat transfer solution.
• Double-symmetry conditions are used to model 1/4 of the connecting pipes + fin.
• A nodal constraint in the global X direction restricts rigid body translation.

• StressCheck’s FEA technology implementation enabling modeling of very thin domains, including adhesive layers with 3D-solid elements.
• Best practices and guidelines for modeling and analyzing 3D bonded repair doubler variations (e.g. racetrack/rectangular, circular/elliptical, tapered, metallic, ply-by-ply, homogenized, etc.) for circular cutouts and grindouts.
• Performing “what if?” logic-driven studies of a digital 3D bonded repair handbook solution via StressCheck API-powered Engineering Simulation App, in which user-defined input data is passed from Python or Excel VBA to StressCheck Professional to perform scripted “on-the-fly” model adjustments and repair-oriented computations.