Improving Your Structural Mechanics Simulations with Release 14.0

Transcription

1 Improving Your Structural Mechanics Simulations with Release

2 What will Release 14.0 bring you? 2

3 Let s now take a closer look at some topics 3

4 MAPDL/WB Integration Finite Element Information Access within ANSYS Mechanical 4

5 Motivation ANSYS Workbench is originally a geometry based tool. Many users however also need to control and access the finite element information. 5

6 Selections of Nodes Nodes can be grouped into named selections based on selection logic, using locations or other characteristics or manual selections Box Selection Node Picking Lasso Selection 6

7 Applying Loads and Orientations to Nodes Nodal orientation allows users to orient nodes in an arbitrary coordinate system. Direct FE loads and boundary conditions can be applied to selections of nodes. Nodes oriented in cylindrical system Nodal coordinate system used for solution 7

8 Results on Node Selections Results with first layer of quads removed Results are displayed on elements for which all nodes are selected. Nodes named selections allow to scope on specific regions of the mesh or remove undesired areas. Results on quads layers only 8

9 Restart and Direct FE Loads Added after initial solve Analysis Settings tabular data: No restart point is lost Second Load step modified for restart Nodal Forces and Pressures objects can be added to a restart analysis without causing the restart points to become invalid. Other loads can now be modified without losing the restart points. 9

10 MAPDL/WB Integration Linear Dynamics in ANSYS Mechanical 10

11 Workbench and Mechanical enhancements Modal Superposition Transient MSUP Transient Analysis supported Joint feature can now be used in Harmonics, Random vibration analysis Reaction Force & Moment results is now supported Joints in Harmonic Analyses Reaction Forces in a Harmonic Analyses 11

12 Physics Coupling Data Mapping 12

13 Motivation Exchange files are frequently used to transfer quantities from one simulation to another. New at R14.0 Efficient mapping of point cloud data is required to account for misalignment, non matching units or scaling issues. 13

14 Increased Accuracy The smoothness of the mapped data depends on the density of the point cloud. Triangulation versus Kriging Several weighting options are available to accommodate various data quality. 14

15 Validating the Mapped Data Visual tools have been implemented to control how well the data has been mapped onto the target structure 15

16 Rotating Machines Studying Rotordynamics in ANSYS Mechanical 16

17 Motivation ANSYS Mechanical users need to be able to quickly create shaft geometries as well as analyze dynamic characteristics of rotating systems Industrial fan (Venti Oelde) 17

18 Geometry Creation Geometries can be imported from a CAD system or imported from a simple text file definition as used in preliminary design 18

19 Import/Export of Bearing Characteristics ANSYS provides an interface that allows to import bearing characteristics from an external file 19

20 Specific Solver Settings Rotordynamics analyses require a number of advanced controls: Damping Solver choice Coriolis effect 20

21 Campbell Diagrams Campbell diagrams are used to identify critical speeds of a rotating shaft for a given range of shaft velocities 21

22 Composites Enhanced Analysis Workflow and Advanced Failure Models for Composites 22

23 Motivation Efficient workflows and in-depth analysis tools are required to model and understand complex composites structures 23

24 Defining Material Properties Composites material require specific definitions including orthotropic properties, as well as some constants for failure criteria (Tsai- Wu, Puck, LaRc03/04) 24

25 Manually Defining Layers on Simple Geometries Users can define simple layered sections for a shell body as well as define thicknesses and angles as parameters 25

26 Defining Layers on Complex Geometries Courtesy of TU Chemnitz and GHOST Bikes GmbH For complex geometries, the ANSYS Composite PrepPost tool is used and layer definitions are imported in the assembly model in ANSYS Mechanical. 26

27 Investigating Composites Results ANSYS Mechanical supports layerwise display of results. ANSYS Composite PrepPost offers comprehensive capabilities for global and plywise failure analysis. 27

28 Advanced Failure Analysis Initial crack 2D laminar composite Crack growth simulation based on VCCT is available to simulate interfacial delamination. Start of damage (layer 1) Progressed damage (layer 1) Progressed damage (layer 3) Progressive damage is suitable for determining the ultimate strength of the composite (last-ply failure analysis) 28

29 Customization ANSYS Design Assessment 29

30 Motivation Many of you have expressed the need for: Computing and displaying specific results Be able to achieve more complex User defined results 30

31 Expanded Result Access Modal=No Beam Results DA + Allow all Available Results allows beam results Filtering of potentially invalid combinations can be suppressed to enable greater user control. This allows the user to access results not typically available in the base analysis. 31

32 Design Assessment for Advanced User Defined Results Design Assessment enable users to extend user defined results capabilities with: Expressions, including mathematical operators Coordinate systems, Units Systems Integration options Nodal, Element-Nodal & Elemental result types 32

33 Thin Structures Mesh Connections 33

34 Motivation In order to connect meshes of different surface parts so as to merge nodes at intersections, users do not always want or cannot merge the topologies at the geometry level. Mesh based connections are required. 34

35 Mesh Connections Mesh connections work at part level: As a post mesh operation Base part mesh is stored to allow for quick changes in connections 35

36 Modal Analyses Shows Proper Connections of the Various Bodies 36

37 Further Meshing Enhancements 37

38 Virtual Topologies Interactive Editing User selects entities then applies VT operations Direct access to operations from RMB menu Virtual topologies are handled more interactively through direct graphics interaction rather than tree objects. 38

39 VT Hard Vertex, Edge and Face Splits Hard vertices can be added at any location on an edge or a face. Hard vertices can then be used to create face splits from virtual edges. 39

40 Virtual Topologies Applications Get swept mesh on non-sweepable bodies Improve shell mesh quality and orthogonality with VT combinations 40

41 Contact Analysis Rigid Body Dynamics 41

42 Motivation Many mechanisms and assemblies have components that operate through contact. 42 In order to maintain the rapid turnaround for RBD simulations, there has been a subsequent focus on improving speed, accuracy and reliability of the contact capability.

43 Performance Improvements Valve: 158 sec elapsed time (2x speed up) Transition and jump prediction have been greatly improved Piston: 9 sec elapsed time (7.5x speed up) The applicability, robustness and efficiency of the contact has been improved for speed and accuracy expect a typical 2-5x speed-up 43

44 Contact Analysis Flexible bodies 44

45 Motivation While already providing leading edge technology, ANSYS continues to enhance its ability to robustly and efficiently solve complex contact problems 45

46 Projected Contact Regular contact Projection based Smoother temperature results on a multilayered structure The Surface Projection Based Contact provides more accurate results (stresses, pressures, temperatures) and is now also available for bonded MPC contacts Improved pressure results with surface projection 46

47 Contact accuracy and robustness Adjust to touch causes rigid body motion and leaves a gap New contact stabilization prevents rigid motion Contact stabilization technique dampens relative motions between the contact and target surfaces for open contact 47

48 Performance Further benefits from GPU boards 48

49 Motivation + Taking advantage of the latest hardware is mandatory to solve your large models. A combination of relatively new technologies provides a breakthrough means to reduce the time to solution 49

50 Distributed ANSYS Supports GPUs 2.1 MDOF, Nonlinear Structural Analysis using the Distributed Sparse Solver GPU Acceleration can now be used with Distributed ANSYS to combine the speed of GPU technology and the power of distributed ANSYS 50

51 Speed-up from a single GPU board Linux cluster : Each node contains 12 Intel Xeon series cores, 96 GB RAM, NVIDIA Tesla M2070, InfiniBand Solder balls Results Courtesy of MicroConsult Engineering, GmbH Mold PCB Solder Joint Benchmark - 4M DOF, Creep Strain Analysis 51

52 Speed-up from multiple GPU boards Linux cluster : Each node contains 12 Intel Xeon series cores, 96 GB RAM, NVIDIA Tesla M2070, InfiniBand Solder balls Results Courtesy of MicroConsult Engineering, GmbH Mold PCB 52

53 Advanced Modeling Material Models 53

54 Motivation ANSYS provides a comprehensive library of advanced materials. Some users however need even more advanced models to include complex nonlinear phenomena in their simulations. 54

55 Advanced Materials for Biomechanical Applications Anisotropic Hyperelasticity plus Viscoelasticity for strain rate effects Hydrocephalus analysis Hyperelastic material with porous media Hyperelasticity coupled with Pore Pressure element Shape Memory Alloy enhanced with superelasticity, Memory effect, New Yield Function, Differentiated Moduli (Austenite, Martensite) Holzapfel Model - Capture the behavior of fiber-reinforced tissue Stent modeling using shape memory alloys 55

56 Plastic heat generation for coupled problems Coupled field-elements for strongly coupled thermo-mechanical analysis now accounts for plasticity induced heat generation along with friction effects Friction Stir Welding including heat generation due to friction and plastic deformation 56

57 Advanced Modeling Advanced Methods 57

58 Motivation The solver techniques available from our solutions allow to model complex phenomena. In some cases, better or different techniques are required to improve the accuracy or the convergence of the models. 58

59 Advanced Nonlinear Methods Hot-Rolling Structural Steel Analysis with 3-D Rezoning Buckling of a pre-stressed stiffened container User can now perform: Buckling from a nonlinear prestressed state, including dead loads 3D rezoning for very large deformations for a wider range of materials and boundary conditions. 59

60 Analyzing Fasteners under Large Deformations Pre-tension element - Significant bending stress with large rotation Bolt pretension does not include large rotation effects. With release 14.0, you can now use Joint Loads: Lock joint at specific load step Apply Pre-Tension or Pre-Torque load use iterative PCG solver for faster runtime Joint Element - Stress appears without significant bending 60

61 Coupled structures/acoustics simulations Coupled problems are modeled more efficiently: Quadratic tetrahedral acoustics elements New acoustics sources Absorbing areas Enhanced PML formulation Near and far-field parameters 61

62 Moisture Diffusion Moisture induces hydroscopic stresses and alters thermal stresses. Coupled-field elements allow to incorporate moisture effects in thermal, structural and coupled simulations. 62

63 Advanced Modeling Explicit Analysis 63

64 Motivation Explicit formulations extend the range of problems a structural engineer can solve. Providing handling capabilities similar to implicit solutions provides an easy transition from implicit to explicit. 64

65 A Common User Interface Crimping Implicit and explicit solutions share the same user interface for a shortened learning curve and allow straightforward data exchange between disciplines 65

66 New tetrahedral element Self Piercing Rivet The new tetrahedral element helps quickly model complex geometries for low velocity applications such as drop tests for mobile phones or nuclear equipments 66

67 Fast Solutions Using 2-D Formulations 2D forming Axisymmetric bullet model Similarly to implicit analyses, 2D plain strain and axisymmetric formulations provide faster computation of explicit solutions 67

68 Geometry Advances for Structural Engineers 68

69 Motivation With every release, ANSYS improves the quality of the geometry tools available in Workbench in order to increase the quality of the geometric data. Ease of use is also constantly improved to provide more efficient tools. 69

70 Mid Surfacing Improvements Selection tolerance is available to handle face pairs in case of imperfect offsets. Body thicknesses can be displayed on the model. 70

71 Usability Enhancements Toolbars can be customized for easy and direct access to preferred features and tools. 71 Hot keys are also available for frequently used operations.

72 SpaceClaim Direct Modeler Preview sharing allow to control topology sharing before transferring the model into Workbench. Regular patch Multi-face patch option increases the quality of repairs for missing faces. Multi-face patch 72

73 Physics Coupling System Optimization with Rigid Body Dynamics and Simplorer co-simulation 73

74 Motivation Most mechanisms and assemblies are managed via control systems. System simulation, including the details of the mechanism or assembly, are needed in order to improve modeling accuracy, fidelity and ultimately system optimization. 74

75 Linking Mechanical and Simplorer Inputs and outputs are defined as pins in the Mechanical model and connected to the schematics of Simplorer 75

76 Simulation Results Force Applied on Pistons Rotational Displacement Rotational Velocity 76

77 Some Examples Aircraft Landing Gear Robotic Arm Control RBD model Simplorer schematic of hydraulic circuit and control Trace of arm trajectory 77

78 And there is much more 78

79 check the Release Notes! 79

80 Think also of the Technology Demonstration Guide 80

81 Thank you for attending this session 81