Design of Automotive Towing DevicesGh.L. Mogan, I.D. Buzdugan β€” Transilvania University of BraΘ™ov
Software guideGuide.3.7

Checking joint 4-5 (welded joint) with MDESIGN

In the steps below, πŸ–± means a left mouse click and β†’ leads to the next action. Labels in the screenshots are those of the MDESIGN interface.

1. Loading diagram and input data

Loading diagram in the XYZ coordinate system of the ATD

Input data (Sec.3.5, Ex.3.5)

Forces: FX = 1500 N, FY = 300 N, FZ = 700 N.

Moments: MX5 = 25500 Nmm, MY5 = 183500 Nmm, MZ5 = 24000 Nmm.

Geometric parameters: h5 = 50 mm, t5 = 5 mm; a = 3 mm.

Material: S235, weldable general-purpose steel.

Operating constraints: temperature T = (βˆ’30…40) Β°C.

Loading diagram in the xyz coordinate system of MDESIGN

Forces and moments in the MDESIGN xyz coordinate system

Forces: Fx = βˆ’FZ = βˆ’700 N, Fy = FX = 1500 N, Fz = FY = 300 N.

Moments: Tx = MZ5 = 24000 Nmm, My = βˆ’MX5 = βˆ’25500 Nmm, Mz = MY5 = 183500 Nmm.

2. Entering the data in MDESIGN (Annex.MD.2)

2.1 Launching the application

Opening the MDESIGN Weld Standard module

πŸ–±β†’πŸ–±β†’πŸ–±

Resetting the data of the automatically loaded application

πŸ–± β†’ [πŸ–± select the command ] β†’ [πŸ–± select the option ].

Saving the application

πŸ–± (, ) β†’ : [ select the folder where the application will be saved],

[ enter the file name Welded joint 4-5], [: ], πŸ–±

[the title of the main window shows: ].

Opening the application (if it was created and saved earlier)

[select the folder where the application is saved] β†’ πŸ–±

Note. While working, save intermediate versions regularly for safety (the system may freeze), using πŸ–± or F10.

2.2 Selecting the Input window and general settings

Selecting the language

[πŸ–± select from the list the option ].

Selecting the Input page

Notes.

– the option is selected to view the results obtained after solving;

– the option is selected to view the input data.

General options (selected from the attached lists)

Notes.

– the option means static strength analyses;

– the option indicates that the assessment follows the DIN EN ISO 5017/2012 standard;

– the option indicates that residual (internal) stresses are not taken into account.

2.3 Entering the geometric, technological, loading and material data

Entering the weld geometry (Geometry)

Choosing the type of weld ()

πŸ–± () β†’ : πŸ–± select πŸ–± (the selected name appears automatically in the text box).

Note. The selection can also be made from the attached list.

Choosing the geometry of the beam section ()

πŸ–± () β†’ : πŸ–± select πŸ–± β†’ : πŸ–± select from the list , πŸ–± β†’ : πŸ–± select from the list , πŸ–± (the section data are filled in automatically in the grey boxes, which cannot be edited).

Note. The selection can also be started from the attached list.

Choosing the weld type ()

[πŸ–± select from the list (fillet weld)].

Choosing the type of weld bead ()

[πŸ–± select from the list (fillet weld)].

Entering the wall thickness of the welded element ()

[enter the thickness in the box , e.g. 4].

Entering the weld thicknesses ()

[enter the thicknesses in the boxes , e.g. 3/3/3/3].

Note. After the selections and entries above, the result is:

Entering the loading data (Loading data)

Entering the axial force ()

[enter the axial force in the box , e.g. βˆ’700].

Entering the shear force ()

[enter the shear force along the y axis in the box , e.g. 1500].

Entering the shear force ()

[enter the shear force along the z axis in the box , e.g. 300].

Entering the bending moment ()

[enter the bending moment about the y axis in the box , e.g. βˆ’25500].

Entering the bending moment ()

[enter the bending moment about the z axis in the box , e.g. 183500].

Entering the torsional moment ()

[enter the torsional moment (about the x axis) in the box , e.g. 24000].

Entering the maximum-load factors (/////)

[enter the factor values in the corresponding boxes, e.g. 1.5/1.5/1.5/1.5/1.5/1.5].

Note. After the selections and entries above, the result is:

Entering the material data (Material Data)

Choosing the database ()

[select from the list πŸ–± (the MDESIGN database)].

Choosing the material type ()

[select from the list πŸ–± (steel)].

Choosing the material designation ()

πŸ–± β†’ : [select the row with the material ()] πŸ–± (the material data are filled in automatically in the grey boxes, which cannot be edited).

Entering the material factor ()

[enter the value in the corresponding box, e.g. 1.1].

Note. After the selections and entries above, the result is:

Meaning

Rm – ultimate strength; Re – yield point.

3. Solving the model and saving the results

πŸ–±or πŸ–±
or F10		β†’ Correct any inconsistencies or errors in the input data (only if warning windows appear)β†’ πŸ–± or πŸ–±
or F10		β†’ πŸ–± β†’
Weld 4-5.pdf β†’ πŸ–±

4. Input data and results (Annex.MD.3.7_4-5)

Selecting the Output page

Geometry data

Meaning

– yS, zS – position of the centre of gravity of the part (beam section); ywS, zwS – position of the centre of gravity of the welds;

– Aw – area; Iw – second moment of area about the y/z axis; weld; above; below; right; left;

– Awges – total area of the welds; Iwges – total second moment of area about the y/z axis.

Loading data

Meaning

– Load specifications – the loads in the section; Fx – axial force; Fy/Fz – shear loads; My/Mz – bending moments; Tx – torsional moment;

– Factors for max. load – the maximum-load factors.

Results obtained

Normal stresses due to the axial force Fx (row 1 for the nominal force, row 2 for the maximum force)

Shear stresses due to the shear force Fy (row 1 for the nominal force, row 2 for the maximum force)

Stresses due to the shear force Fz (row 1 for the nominal force, row 2 for the maximum force)

Normal stresses due to the bending moment My (row 1 for the nominal moment, row 2 for the maximum moment)

Normal stresses due to the bending moment Mz (row 1 for the nominal moment, row 2 for the maximum moment)

Shear stresses due to the torsional moment Tx (row 1 for the nominal moment, row 2 for the maximum moment)

Resultant normal stresses (row 1 for the nominal loads, row 2 for the maximum loads)

Resultant shear stresses (row 1 for the nominal loads, row 2 for the maximum loads)

Maximum stresses in the weld for each type of load

Maximum and allowable stresses

Meaning

– Normal stresses caused by the axial force Fx; shear stresses caused by the shear force Fy; shear stresses caused by the shear force Fz; normal stresses caused by the bending moment My; normal stresses caused by the bending moment Mz; shear stresses caused by the torsional moment Tx;

– Resultant normal stresses (maximum); resultant shear stresses (maximum);

– Οƒres – maximum resultant normal stress; Ο„res – maximum resultant shear stress; Οƒzul – allowable normal stress; Ο„zul – allowable shear stress.

5. Checks

Strength check for normal stresses

Οƒres ≀ Οƒzul; 33.072 < 106.364 (satisfied).

Strength check for shear stresses

Ο„res ≀ Ο„zul; 10.83 < 106.364 (satisfied).