I used a bearing force in Inventor and tried the same in Solidworks with identical results. "LIFTING_LUG" is a spreadsheet program written in MS-Excel for the purpose of analysis of lifting lugs, used in rigging operations. This validation case follows the Air Force example to ensure consistent results between the Air Force Manual . Determine the value 0.4 F nu.L. Numerous lug sizing theories have been devised to calculate lug joint strength. Lifting lugs, also known as padeyes, are among the most common joining methods. These calculations can be used to asses a joints . All of the material properties needed to calculate the static strength of a lug using this material and the ESDU method, are defined in MMDH for the . The list can keep going such as lug analysis, bolt bending, plastic bending, crippling, etc. in reply to: murray_ty 08-30-2017 10:06 AM . Enter Figure 9-23 and read k 1, k 2, and k 3; calculate the product k 1 k 2 k 3. Message 2 of 4 Binga. Guidance is provided for general bolted joint design, computation of preload uncertainty and preload loss, and the calculation of the bolted joint factor of safety. . An overview of the current methods used to analyze bolted joint connections is given. Do a simple fixed constraint on the bottom of the triangle, as seen below. A finite-element (FE) analysis was completed on the three components comprising the top section of the lifting beam. The lifting classes are described in DIN 15018. Calculator. An electrical lug has to satisfy the design load bearing considerations. The input form pertaining to the minimum set of inputs is shown below: The joint can optionally include an outer set of female lugs. Lifting calculation method 5. 31 August 2016 - Rev A added, added links and included general corrections and improvements. Licensing and download process typically take 24hrs. = 5.0). . Without the parenthesis in the denominator the numerator is only divided by "W" and not " (W* (t^2/6)). The outcome is an easy to use tool . Note that the spreadsheet cells with blue ink are the input values - all other cells are either text or values generated by the spreadsheet. the theoretical calculations. Typically faster to setup than a complex FEA model. Hello, I'm designing a lift lug for 25000lbs. 0 Likes Reply. The bolted joint is among the most common joining methods -- other common joining methods include riveting, welding, press fits, pins, keys, and adhesives. The user can enter a desired factor of safety (most applications, F.S. Cost for annual license, $996.00. A lug, also known as a lifting lug is essentially a plate with a hole in it where the hole is sized to fit a clevis pin. 1. Do an analysis on the lifting lug shown below, ignoring the larger body thing you are designing. Solve non-linear analysis problems. But I think you get the idea. Check it out, and as always you can download this, and many other Excel tools at:w. With the angle formed between : the two slings connecting the most distant points if no specific balancing system is used. In order to validate the load bearing capability of the lug design finite element analysis with material nonlinearity is . This calculation is sample showing the analysis of a lug. In Section 9.6 of the Air Force Stress Analysis Manual, an example is provided for an axially loaded lug. Free Engineering Spreadsheets: Lug Analysis - Axial Strength. 1.5 - Updated install process. "LIFTING_LUG" is a spreadsheet program written . Gives a good starting point for a design. Hand Calculation Benefits. Lifting Lug Design Spreadsheet Calculator. This course discusses: Overview of lug analysis. Then I found this calculator: Adequate for the complete analysis of simpler problems. The first methods were simple cross sectional area techniques that resulted in robust, but over-designed lug joints. I have tried to verify using hand calculations etc but these lugs/bearing type problems are complicated and I haven't found a method that seems to agree with either of the answers. The Air Force Method of lug analysis is widely used in industry and is documented in the Stress Analysis Manual of the Air Force Flight Dynamics Laboratory (FDL). AA-SM-009-002 Lug Analysis - Axial Strength.xlsx. 343.76 KB File Size. 1.4 - Status . Bearing failure 4. Lifting Lug Design Spreadsheet Calculator. . Hand calculations were used to determine the adequacy of the lower section of the lifting beam and the redesigned 241AZ01A lifting lugs. 3.898515 N/mm2 11783.33 mm3 1414 mm2. Engineering Excel Spreadsheet Downloads Welding Design and Engineering Pressure Vessel Design and Engineering. 9.15 Analysis of Lugs with Less Than 5 PCT Elongation. thekal there is nothing wrong with the calculation but you most likely need to install the XLC addin which can be downloaded from this site (follow the 'Main Menu'). This method follows closely with the methods presented in Melcon & Hoblit and Bruhn, and it relies heavily on curves generated by empirical data.Although this method is somewhat more complex than other lug analysis methods, it is . March 2, 2016 Last Updated. 5 ) C {e} = \frac {\displaystyle 1} {\displaystyle \cos (0.5 \cdot \alpha)} C e = cos(0.5)1. . Contact Andrew via email, contact@lugcalc.com to initiate purchase request. Minimum required factor of safety is 3. F.O.S Bearing on Plate @ Pin Welds for Lug . In the 1950's, the work of M. A. Melcon, F. M. Hoblit, and F. P. Cozzone from the Lockheed Aircraft Corporation improved upon the original cross . No need for expensive software. The multiplier factor can be calculated as follow : C e = 1 cos ( 0. Lug Analysis.zip. INTRODUCTION 4. Performs calculations for lug strength, pin strength, and double shear joint strength; 9.5 Single-Shear Joint Strength Under Uniform Axial Load. Enter Figure 9-22 to check that the lug dimensional ratios fall within the region covered by the method. File. There is a spreadsheet for each of the individual failure modes : AA-SM-009-001 Lug Analysis - Shear Bearing Strength.xlsx. My FEA results show maximum stress 19.89ksi - way to high for A36 material. Key Words: FEA, lugs, pin, margin of safety, Vonmises stress, ANSYS. . Use a surface region to apply the applied force (from lifting, equal to weight of body), as this is where the strap, cable or chain would be placed. and there is a fully automated sheet that does all of the calculations and calculates the interaction: presence of a "comment box" is denoted by a "red triangle" in the upper right-hand corner of a cell. Lug thickness, tL A = 42.9 mm 40 Lug radius, rL C = 95.5 mm 70 Since A & C clearance against Lug size , Therefore the Lug is is ACCEPTABLE Per PTS Section 6.3 a) Lug hole diameter, d shall be Max of i) Dp + 3mm ii) Dp X 1.05 b) Lug hole diameter, d shall be less than < (Dp + 6mm) Report. Lugs are connector type elements used as structural supports for pin connections. My concern is the coding in the excell spreadsheet in which leaving out the parenthesis makes a significant difference. This is another commonly used method to determine the loads induced in the fasteners of a joint, another type of classical hand calculations in structural analysis. Action. If included, results will also be calculated for the two female lugs and for double . Bolted Joint Analysis. The value of P ub.P on the right hand side of Equation (9-16) . . 2 File Count. Here's a simple sizing calculator for the most basic type of lifting lug. The male lug strength, female lug strength, and double shear joint strength are calculated. The author may have multiplied t instead of squared t as well. AA-SM-009-003 Lug Analysis - Transverse Strength.xlsx. Shear failure along two planes 3. For more information on the redesigned 241AZ01A lifting lugs, reference drawing H-2-820775 . Back to Topic Listing; Previous; Next; 3 REPLIES 3. LUG LAYOUT ksi # min safety factor of 2.0 applied. Lug Analysis Validation. This calculation has been updated to version 1.1 to include calculations for lug shear out, bearing stress and pin bending stresses. LugCalc is a calculator software tool for lug analysis theory and estimating the static structural strength of pinned lug joints used in mechanical designs. Calculator. An analysis can be run specifying only the inputs above. Calculate the allowable net-tension static stress for the lug, F nu.L, according to the method described in Section 9.3.2. LugCalc download is now only available to customers. The method combines the accurate stress distribution obtained by the FE solver with calculation strategies based on a throughout analysis of lug failure modes. Several methods for the design and analysis of bolted joint connections are presented. These calculations can be used to asses a joints . @ Pin below Pin ksi Additional Notes # - the formula used to combine these stresses is equ (3-37) from ASME BTH-1-2005 with fy =0 NOTE: for Category A lifts, Min F.O.S is 2.0 - 2.5 for lug and for Category B lifts, Min F.O.S is 3.0 - 3.6 for the lug. AA-SM-009-004 Lug Analysis - Pin Bending. LugCalc is a calculator software tool for lug analysis theory and estimating the static structural strength of pinned lug joints used in mechanical designs. 1. March 2, 2016 Create Date. Scroll for Details . The program will determine the ultimate strength of the lifting lug based on several checks and will apply the desired factor of safety to the strengths to attain allowable loads for the lifting lug. Free Engineering Spreadsheets: Lug Analysis - Pin Bending. The calculator has been designed for use with a simple s106 Lifting Lug on page 7 of the specification for the Air Force Method of design for the determination of design conditions. The static lug strength analysis in ESDU 91008 includes the effect of the material grain flow direction and whether the lug will be fabricated from sheet, casting, bar, extrusion, forging etc. LIFTING LUG ANALYSIS Lifting Lug rigging operations. I did some simple hand calcs and stress was significantly lower. The primary components of a bolted joint include the threaded fastener as well as the parts to be joined together (the clamped parts ). Calculating the lug strength and fracture strength. 2 References [1] ASME BTH-1-2005 3 Methodology Lug analysis involves several failure modes, associated with different areas of the lug 1. LugCalc Version History: 1.6 - Fixed lug geometry errors, improved graphics, enhanced general performance, eliminated bugs. Note that the spreadsheet cells with blue ink are the input values - all other cells are either text or values generated by the . the two slings connecting points side by . AA-SM-009-002 Lug Analysis - Axial Strength. Tension failure across the net section 2. Lugs are used in combination with clevis pins to transmit load between different mechanical components. Calculation Reference American Institute of Steel Construction (AISC) 13th Edition Allowable . Simplified method of lug analysis, including: Tension failure across the net section. The equation seems appropriate. Combining FEA and Hand Calculations. Design calculations for lifting lug welded onto equipment, like pressure vessels etc. Combining material, geometry, and loads, LugCalc will walk you through the analysis steps required to estimate a lug joints static strength. Combining material, geometry, and loads, LugCalc will walk you through the analysis steps required to estimate a lug joints static strength. Engineers that use FEA should combine it with hand calculations. In this case, only the male lug strength results will be calculated. 3) 3D Rigid Body Analysis - Fastener Loads for a rigid joint.
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