AA-SM-009-002 Lug Analysis - Axial Strength.xlsx. The equation seems appropriate. 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 two slings connecting points side by . In order to validate the load bearing capability of the lug design finite element analysis with material nonlinearity is . I used a bearing force in Inventor and tried the same in Solidworks with identical results. This calculation is sample showing the analysis of a lug. Minimum required factor of safety is 3. . F.O.S Bearing on Plate @ Pin Welds for Lug . An analysis can be run specifying only the inputs above. For more information on the redesigned 241AZ01A lifting lugs, reference drawing H-2-820775 . Lug Analysis Validation. But I think you get the idea. the theoretical calculations. 3.898515 N/mm2 11783.33 mm3 1414 mm2. AA-SM-009-003 Lug Analysis - Transverse Strength.xlsx. Calculator. . 31 August 2016 - Rev A added, added links and included general corrections and improvements. This validation case follows the Air Force example to ensure consistent results between the Air Force Manual . Here's a simple sizing calculator for the most basic type of lifting lug. 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 . LugCalc is a calculator software tool for lug analysis theory and estimating the static structural strength of pinned lug joints used in mechanical designs. Free Engineering Spreadsheets: Lug Analysis - Pin Bending. "LIFTING_LUG" is a spreadsheet program written . There is a spreadsheet for each of the individual failure modes : AA-SM-009-001 Lug Analysis - Shear Bearing Strength.xlsx. The author may have multiplied t instead of squared t as well. The method combines the accurate stress distribution obtained by the FE solver with calculation strategies based on a throughout analysis of lug failure modes. If included, results will also be calculated for the two female lugs and for double . 0 Likes Reply. The value of P ub.P on the right hand side of Equation (9-16) . In Section 9.6 of the Air Force Stress Analysis Manual, an example is provided for an axially loaded lug. The primary components of a bolted joint include the threaded fastener as well as the parts to be joined together (the clamped parts ). Action. Free Engineering Spreadsheets: Lug Analysis - Axial Strength. In this case, only the male lug strength results will be calculated. Note that the spreadsheet cells with blue ink are the input values - all other cells are either text or values generated by the spreadsheet. 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. Lugs are used in combination with clevis pins to transmit load between different mechanical components. The first methods were simple cross sectional area techniques that resulted in robust, but over-designed lug joints. Combining material, geometry, and loads, LugCalc will walk you through the analysis steps required to estimate a lug joints static strength. in reply to: murray_ty 08-30-2017 10:06 AM . Message 2 of 4 Binga. Note that the spreadsheet cells with blue ink are the input values - all other cells are either text or values generated by the . 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'). 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. Do an analysis on the lifting lug shown below, ignoring the larger body thing you are designing. Lug Analysis.zip. Enter Figure 9-23 and read k 1, k 2, and k 3; calculate the product k 1 k 2 k 3. The bolted joint is among the most common joining methods -- other common joining methods include riveting, welding, press fits, pins, keys, and adhesives. Lifting Lug Design Spreadsheet Calculator. Lifting lugs, also known as padeyes, are among the most common joining methods. Bolted Joint Analysis. These calculations can be used to asses a joints . AA-SM-009-004 Lug Analysis - Pin Bending. 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. These calculations can be used to asses a joints . Hello, I'm designing a lift lug for 25000lbs. With the angle formed between : the two slings connecting the most distant points if no specific balancing system is used. LIFTING LUG ANALYSIS Lifting Lug rigging operations. Cost for annual license, $996.00. Shear failure along two planes 3. and there is a fully automated sheet that does all of the calculations and calculates the interaction: Back to Topic Listing; Previous; Next; 3 REPLIES 3. Several methods for the design and analysis of bolted joint connections are presented. No need for expensive software. The list can keep going such as lug analysis, bolt bending, plastic bending, crippling, etc. The male lug strength, female lug strength, and double shear joint strength are calculated. File. March 2, 2016 Create Date. Contact Andrew via email, contact@lugcalc.com to initiate purchase request. 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. INTRODUCTION 4. Then I found this calculator: LugCalc download is now only available to customers. 1. LUG LAYOUT ksi # min safety factor of 2.0 applied. Adequate for the complete analysis of simpler problems. 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. This course discusses: Overview of lug analysis. Hand Calculation Benefits. Engineers that use FEA should combine it with hand calculations. Report. 1.5 - Updated install process. This calculation has been updated to version 1.1 to include calculations for lug shear out, bearing stress and pin bending stresses. Calculator. The lifting classes are described in DIN 15018. The multiplier factor can be calculated as follow : C e = 1 cos ( 0. Design calculations for lifting lug welded onto equipment, like pressure vessels etc. Engineering Excel Spreadsheet Downloads Welding Design and Engineering Pressure Vessel Design and Engineering. 3) 3D Rigid Body Analysis - Fastener Loads for a rigid joint. Scroll for Details . Tension failure across the net section 2. Licensing and download process typically take 24hrs. Key Words: FEA, lugs, pin, margin of safety, Vonmises stress, ANSYS. Calculating the lug strength and fracture strength. 5 ) C {e} = \frac {\displaystyle 1} {\displaystyle \cos (0.5 \cdot \alpha)} C e = cos(0.5)1. . The outcome is an easy to use tool . 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). The user can enter a desired factor of safety (most applications, F.S. = 5.0). 2 File Count. "LIFTING_LUG" is a spreadsheet program written in MS-Excel for the purpose of analysis of lifting lugs, used in rigging operations. Typically faster to setup than a complex FEA model. Solve non-linear analysis problems. 343.76 KB File Size. Calculate the allowable net-tension static stress for the lug, F nu.L, according to the method described in Section 9.3.2. . Without the parenthesis in the denominator the numerator is only divided by "W" and not " (W* (t^2/6)). . 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. Calculation Reference American Institute of Steel Construction (AISC) 13th Edition Allowable . @ 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. A finite-element (FE) analysis was completed on the three components comprising the top section of the lifting beam. Hand calculations were used to determine the adequacy of the lower section of the lifting beam and the redesigned 241AZ01A lifting lugs. Combining FEA and Hand Calculations. Performs calculations for lug strength, pin strength, and double shear joint strength; 9.5 Single-Shear Joint Strength Under Uniform Axial Load. Simplified method of lug analysis, including: Tension failure across the net section. An electrical lug has to satisfy the design load bearing considerations. LugCalc Version History: 1.6 - Fixed lug geometry errors, improved graphics, enhanced general performance, eliminated bugs. My FEA results show maximum stress 19.89ksi - way to high for A36 material. Do a simple fixed constraint on the bottom of the triangle, as seen below. 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 . I did some simple hand calcs and stress was significantly lower. Numerous lug sizing theories have been devised to calculate lug joint strength. LugCalc is a calculator software tool for lug analysis theory and estimating the static structural strength of pinned lug joints used in mechanical designs. Lugs are connector type elements used as structural supports for pin connections. 9.15 Analysis of Lugs with Less Than 5 PCT Elongation. Gives a good starting point for a design. 2 References [1] ASME BTH-1-2005 3 Methodology Lug analysis involves several failure modes, associated with different areas of the lug 1. March 2, 2016 Last Updated. 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) 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. Lifting Lug Design Spreadsheet Calculator. Determine the value 0.4 F nu.L. Enter Figure 9-22 to check that the lug dimensional ratios fall within the region covered by the method. Combining material, geometry, and loads, LugCalc will walk you through the analysis steps required to estimate a lug joints static strength. 1.4 - Status . Bearing failure 4. My concern is the coding in the excell spreadsheet in which leaving out the parenthesis makes a significant difference. . 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. An overview of the current methods used to analyze bolted joint connections is given. AA-SM-009-002 Lug Analysis - Axial Strength. 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 . Check it out, and as always you can download this, and many other Excel tools at:w. presence of a "comment box" is denoted by a "red triangle" in the upper right-hand corner of a cell.

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