Workshop Problems for DRD's ANSYS Mechanical Nonlinear Structural Simulation
DRD Workshop 1a - 3D Large Deflection Analysis of a Roto-Molded Plastic Gas Tank
This workshop provides the opportunity for the student to solve the problem first as linear and then with nonlinear large deflection effects to compare the solutions. Students also use this workshop to gain an understanding of step, substeps, and equilibrium iterations and how to use automatic time stepping.
DRD Workshop 1b - Snap Through Analysis of a Spherical Tank Section Using Stabilization
A section of a curved tank needs to be analyzed to check deflections and stress. This geometry will buckle when a sufficient load magnitude is applied. Solution restarts and the stabilization feature is utilized in this workshop.
DRD Workshops 2a - Nonlinear Contact Analysis of a Cell Phone Antenna Snap Fit
In this workshop the student uses a nonlinear contact solution with friction to simulate a cell phone antenna snap fit problem. The problem initially does not converge, and the student adjusts nonlinear model parameters to make it converge. The model then gives incorrect answers, and the student resolves that problem. The student also uses a commands object to control whether the symmetric or unsymmetric solver is used in order to improve solution performance.
DRD Workshop 2b - Nonlinear Contact Analysis of a Ring Gear and Housing Assembly with Interference
This model involves calculating stresses in the housing and ring gear due to initial interference. The initial interference in combination with friction holds the ring gear securely in the housing. This workshop provides additional practice on setting up, solving, and postprocessing nonlinear contact problems.
DRD Workshop 3a - Nonlinear Contact Analysis of a Ring Gear and Housing Assembly with Plasticity
This model involves calculating stresses in the housing and ring gear due to initial interference. This model expands upon workshop 2b and introduces plasticity to the model. Students use a commands object to calculate total strain.
DRD Workshop 3b - 2D Plasticity Analysis of a Threaded Connection including Nonlinear Contact and Elastic-Plastic Behavior
This model represents a four part threaded connection assembly. Nonlinear contact is used to model interaction of the threads and the mating surfaces of the other parts. Students define a multilinear elastic-plastic model and calculate plastic and total strains.
DRD Workshop 4a - 2D Axisymmetric Analysis of a Hyperelastic Rubber Seal with Nonlinear Contact
This four part assembly model has two rubber parts modeled using a hyperelastic material model. Students import experimental data into the Workbench Engineering Data module and curve fit it to create Mooney-Rivlin constants. Initially the model does not converge, and students must modify the model to get it to converge. The model also provides an opportunity for students to experiment with different nonlinear contact formulations including pure penalty, augmented Lagrange, and normal Lagrange.
DRD Workshop 4b - Hyperelastic Seal with Fluid Pressure Penetration Loading
This model is comprised of three parts - a cylinder, ring, and seal. The cylinder enters the bore and contacts the seal to produce pressure between the cylinder and ring. Ideally this pressure would be great enough to keep fluids from breaking the seal. The second step applies fluid pressure to the exposed portion of the seal and continues to be applied to the portions of the seal that 'peel away' from the cylinder or ring. This fluid pressure penetration capability in ANSYS is critical in determining seal performance.
DRD Workshop 4c - 2D Axisymmetric Analysis of a Hyperelastic O-ring with Nonlinear Contact, Using Nonlinear Adaptive Remeshing (NLAD)
This model contains a tube, sleeve, o-ring and swaging body. The swaging body is pushed down, causing the tube to be plastically deformed into the seal, which is a hyperelastic body. A pressure is applied to the inside of the tube at a subsequent time. The o-ring undergoes severe deformation; the Nonlinear Adaptive Remeshing technique is used to remesh the model during the solve process automatically to get a completed solution, rather than the user remeshing manually if the model fails to solve.
DRD Workshop 5a - Nonlinear Contact Analysis of Steel Enclosure with Bolt Pretension
This four part assembly is held together with a pretensioned bolt. Students use Simulation bolt pretension to load the model. The objective of the model is for students to gain a thorough understanding of Simulation bolt pretension. This model also provides additional practice in modeling nonlinear contact.
DRD Workshop 5b - Analysis of a Pump Fluid End with Bolt Pretension
This pump assembly is held together with four pretensioned bolts. Students use load steps to sequentially pretension the bolts one step at a time and then apply additional loads.
DRD Workshop 6 - Nonlinear Contact Analysis of a Control Valve including Gasket Behavior
This control valve has two gaskets, and the objective of the analysis is to optimize the gasket design. Workbench does not yet have gasket elements, so students use DRD developed commands objects to add gasket elements to the model. The model also involves bolt pretension, pressure, mechanism forces, and thermal loads. The model requires linear and nonlinear contact types. Students define temperature dependent material properties.
The initial design does not have a viable gasket design, and students use a design parameter and DesignModeler to modify the design to achieve an optimum gasket design.
DRD Workshop A - Nonlinear Contact Model for Insertion and Removal of a Mechanical Connector
Students solve this mechanical connector problem using nonlinear contact with friction. Weak springs prevent rigid body motion at the beginning of the solution. The course materials provide only a general description of the problem and objectives, and students must solve the problem without detailed instructions.
DRD Workshop B - Nonlinear Contact of a Swaging Operation including Elastic-Plastic Behavior
Students simulate the swaging operation using nonlinear contact with friction, a bilinear elastic-plastic model, and a multilinear elastic plastic model. This workshop requires conversion of a stress-total strain curve to a stress-plastic strain curve for defining the multilinear plasticity model in the Workbench Engineering Data module. The course materials provide only a general description of the problem and objectives, and students must solve the problem without detailed instructions.
DRD Workshop C - Shell Model for a Battery Clip including Nonlinear Contact and Plasticity
This model involves modeling of nonlinear contact and plasticity in a structural shell model. The model simulates the compression of the spring when a battery is inserted into an electronics device. Students use a commands object to activate the shell thickness effect.
DRD Workshop D - Nonlinear Contact Model for Insertion and Removal of a 3D Mechanical Connector
This model is2-part mechanical connecter. The spring leg is inserted into the chassis and then removed. The main goal of this analysis is find out the force required to insert the spring leg into the chassis and then remove it from the chassis. It is also desired to find out the resulting stresses in the connector due to insertion and removal.
DRD Workshop E - Large Deflection Analysis of a Cantilever Beam using Restarts
The main objective of the workshop is to calculate the stresses and deflections of the beam under a given loading. The workshop will stop and start using the restart capabilities of Workbench. Additionally, APDL post-processing commands will be inserted and executed without re-solving the model.
DRD Workshop F: Hyperelastic Model with Nonflowing Incompressible Fluid
This model is comprised of three parts - top and bottom plates and a rubber fluid bladder. The bladder is compressed and non-flowing fluid elements are placed in the bladder to maintain a zero volume loss. The resulting force deflection curve is obtained.