Design Analysis

Shell and Ring Lifting Device

Created By

Meadows Analysis & Design, LLC
Project created on 8/1/2005.
Last updated on 8/1/2005.

Checked By

Marc A. Meadows, P.E.
Project checked on 8/1/2005.

Summary

Description

Upgrade existing 20,000 pound capacity device to 30,000 pounds.

Model Information

Analysis Type - Static Stress with Linear Material Models
Units - English (in) - (lbf, in, s, deg F, deg R, V, ohm, A, in*lbf)
Model location - C:\Temp98\98

Comments from Reviewer

With the modifications of added gussets and a new lifting eye, this device meets the ASME code B30.20.

Analysis Parameters Information

Load Case Multipliers

Static Stress with Linear Material Models may have multiple load cases. This allows a model to be analyzed with multiple loads while solving the equations a single time. The following is a list of load case multipliers that were analyzed with this model.

Load Case Pressure/Surface Forces Acceleration/Gravity Displaced Boundary Thermal Voltage
1 1 0 0 0 0

Multiphysics Information

Default Nodal Temperature 0 °F
Source of Nodal Temperature None  
Time step from Heat Transfer Analysis Last  

Processor Information

Type of Solver Automatic  
Disable Calculation and Output of Strains No  
Calculate Reaction Forces Yes  
Invoke Banded Solver Yes  
Avoid Bandwidth Minimization No  
Stop After Stiffness Calculations No  
Displacement Data in Output File No  
Stress Data in Output File No  
Equation Numbers Data in Output File No  
Element Input Data in Output File No  
Nodal Input Data in Output File No  
Centrifugal Load Data in Output File No  

Part Information

Part ID Part Name Element Type Material Name
1 98 Brick Steel (ASTM - A36)
2 Part 2 Truss AISI 1045 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round

Element Properties used for:

Element Type Brick
Compatibility Not Enforced  
Integration Order 2nd Order  
Stress Free Reference Temperature 0 °F

Element Properties used for:

Element Type Truss
Cross-Sectional Area 3 in²
Stress Free Reference Temperature 0 °F

Material Information

Steel (ASTM - A36) - Brick

Material Model Standard  
Material Source Algor Material Library  
Material Source File C:\Program Files\ALGOR\MatLibs\algormat.mlb  
Date Last Updated 2004/09/30-16:00:00  
Material Description Structural Steel  
Mass Density 7.35e-4 lbf*s^2/in/in³
Modulus of Elasticity 29e6 lbf/in²
Poisson's Ratio 0.29  
Shear Modulus of Elasticity 11.2e6 lbf/in²
Thermal Coefficient of Expansion 6.5e-6 1/°F

AISI 1045 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round - Truss

Material Model Standard  
Material Source Algor Material Library  
Material Source File C:\Program Files\ALGOR\MatLibs\algormat.mlb  
Date Last Updated 2004/10/28-16:02:00  
Material Description None  
Mass Density 0.00073643 lbf*s^2/in/in³
Modulus of Elasticity 29008000 lbf/in²
Thermal Coefficient of Expansion 0.0000063889 1/°F

Load and Constraint Information

Loads

Load Set 1: Unnamed

Nodal Forces

IDDescriptionNode IDMagnitudeVxVyVzLoad CaseCoordinate System ID
130,000 lb.14894 15000 0 1 0 10
230,000 lb.14895 15000 0 1 0 10

Constraints

Constraint Set 1: Unnamed

Surface Boundary Conditions

IDDescriptionPart IDSurface IDTxTyTzRxRyRz
1Fixing lifting surface143YesYesYesNoNoNo

Appendix

von Mises Stresses

The maximum shown is actually due to a concentration in the mesh. We will look at a detail next.

von Mises Stresses Greater Than 12 ksi

ASME B30.20 requires all stresses be at or below 1/3 of the yield point of the material. Since this material is assumed to be A36, then our threshold is 12 ksi.

von Mises Stresses Greater Than 12 ksi

This is simply a zoom in on the interesting areas. I am not concerned with the appearance of some stress here, because it does not propogate and is very isolated.

Displacement

This plot shows that we will get nearly 3/8" deflection at a capacity load.