Tools

The following tools are available:

Export Model to File - creates text file with materials, properties, nodes and elements ids without the model data. The file is used to debug user problems without having the customer model.

Free Edge

Free Edge Tool automatically finds free edges between the elements.

To run Free Edge execute Tools - Free Edge from the main menu. Alternatively, use the Tools context menu.

Tools_menu

Free Edge tool:

Free_edge_finder

Press Find and the table will be filled with the groups of elements that has Free Edges.

Press All to select all groups from the list and None - to deselect;

Press to display only groups of elements.

Press to highlight the selected groups of elements.

- export selected groups to Femap;

- export selected groups to components;

Mass and COG Table

Mass and Center of Gravity Table is used to automatically calculate mass and center of gravity characteristics on the user-defined selections.

To add Mass and Center of Gravity click Tools - Mass and Center of Gravity - Add in the main menu.

Mass_and_COG_table

Selection - elements that will be intersected with the selections defined below;

Elements Count - first value is amount of elements that were found on Selection. Second value is total amount of elements that exist in the model;

COG X, Y, Z - coordinates of the center of gravity;

Mass - mass of the selection.

Note: Overall row is Mass of all selections.

Selections can be defined using Entity List Selector.

Moment Shear Force

In order to check the validity of a ship Moment Shear Force can be performed.

Moment Shear Force

Type = Moment Force.

The Horizontal Axis should be along the length of the model. Model Length is defined automatically = Maximum - Minimum along the Horizontal axis. Portside Axis - the vertical Axis.

Model Length is divided by steps in a number of the location where Forces and Moments will be calculated (N = Moment Length / Step). The Forces and moments will be calculated for the vertical level defined in the Z Level field in every point.

Moment Shear Force Step

Forces are calculated:

Moments are calculated:

where AF is the applied force, RF - reaction force, MF - multi force, AM - applied moment, RM - reaction moment, MM - multi moment in the node, Z - Z level.

Press to display the plot.

Moment Shear Force Plot

Press to display the table:

Moment Shear Force Table

Thickness Plot

Thickness plot is created to display plate elements thicknesses for flat elements selections like frames, decks and longitudinals in Femap.

It displays a nice plot with the properties thicknesses using the text labels. Rthe position of a label is calculated to be on the top elements with the same property:

Thickness_plot

To add a single Thickness Plot click Tools - Thickness Plots - Add in the tree.

Thickness_plot_add

Thickness_plot_add

Flat selections (as frames) are recommended to be used for thickness plots. The selection can be defined in 3 ways:

- select section from the panel finder;

- select a group;

- define any custom selection using Selector Control.

It is required to select the View for the plot. It can be chosen from the list or imported from the Femap active view. To edit selected view options press .

Font Size can be set from 8pt to 32pt. By default 8pt size is used.

In most cases the default value of an Angle may not be changed. Only in case when the selection is quite curved or for hull, it should be increased. If too many labels are displayed on the area with the elements of the same property, increase the Angle option. For a hull 30 degrees are recommended.

Four types of data can be displayed on the labels: plate thickness; property ID; ID and Title; ID, Title and Thickness:

Press to display a plot.

It is also possible to create thickness plots for all sections at once. Execute Tools - Thickness Plots - Create Multiple in the main menu. Alternatively, use the Thickness Plot context menu.

Thickness_plot_create

In the Create Multiple Thickness Plots dialog instead of one selection, few can be defined using Selection List Control. As a result, few plots are created:

Created plots can be added in the report from the toolbox.

Moment Ratio

Moment Ratio calculates Kc factor (Eurocode3), Cb reduction factor (AISC360-10), Cm - moment ratio on the ends of a members found by Beam Member Finder.

It is used in the moment reduction factors calculations in the following standards: API 2A RP (table D.3-1), ISO 19902 (table 13.5-1) and Norsok N004 (table 6-2):

And moment reduction factors according to Eurocode3 (table 6.6):

Cb (Aisc2010) lateral-torsional buckling modification factor for AISC360-10 is calculated for the Moment Ratio Torsional Y and Z:

Moment_ratio_Cb_factor

Cb lateral-torsional buckling modification factor for AISC ASD 89 (Section F1.3) is calculated for Moment Ratio Torsional Y and Z:

Moment_ratio_Cb_factor_lateral

class="button-title">Edit.

Four moment ratio tools are created by default for length y, length z and length torsional members with Y/Z moment ratios.

Moment_ratio_edit

To display the Moment Ratio execute from the context menu Edit.

The following dialog will be displayed:

Moment_ratio

M1(end min) and M2(end max) - the bending moment on the ends of the beam member.

M1/M2 - the moment ratio between the ends of the beam member..

Min/Max - the minimum/maximum bending moment over the full member.

Kc - the reduction factor according to Eurocode3, Part 1-1 Table 6.6.

Cb(Aisc89) - the lateral-torsional buckling modification factor according to AISC ASD 89.

Cb(Aisc2010) - the lateral-torsional buckling modification factor according to AISC360-10.

Select Load using Selector Control.

- plot moment ratios (M1/M2) for the selected members;

Moment_ratio_plot

- plot ids for the selected members;

- plot Cm Type for the selected members. Cm type can be changed in Beam Member Finder:

Moment_ratio_cm

- plot Kc factor;

- plot Cb factor for AISC ASD 89 or AISC 360-10;

- highlight the selected beam members;

- preview only selected beam members.

For the selected member the bending moment diagram is displayed. End moments, Min/Max over the full member are shown with labels:

Moment_ratio_labels

Example: Calculation of the reduction moment factors Cm according to ISO 19902:

Weld Summation Tool

Weld Summation tool is used to summarize Grid Point Forces that will be used in Weld Checks to calculate the weld stresses.

Weldsummation

There are two methods available:

  • Summarize per weld part - summarize forces at all welded nodes of the respective weld part;
  • Summarize per elements (beta) - calculate forces at each welded node of respective weld part element. Force is summed from neighbor elements that contain only one welded node;

Show results only for welded parts - display only welded parts of the welds in the table. The non-welded parts do not provide results in weld checks.

Select Load and press Fill Table to display force summation for all welded parts.

Summarize per element

This method is used for the straight welds. Weld length and a coordinate system are taken from the Weld Finder Tool.

Weldsummation_plot

Forces are summarized over the weld nodes (41 - 47) using elements only from the respective weld part (101 - 126).

Weld part origin is used to calculate a moment arm for extra moments from the forces.

After forces are summarized, they are transformed into a weld part coordinate system.

This method calculates forces for each node and related element from a weld part. Besides the weld length and a coordinate system are calculated for each weld node taking into account neighbor weld part elements.

Weld length is a sum of the half of the element's length along the weld direction from both sides of the weld node (L2-L6 on the picture):

Weldsummation_part

Note: If the weld is not closed the weld length for the start and for the end nodes is taken as a full length along the weld direction of the neighbor element (L1 and L7 on the picture).

Elements that are attached with one node to the weld are not taken into account in weld checks. Forces/moments are transferred to the neighbor elements by the portion of their weld length in the calculations:

Weld line

F1=f*(a/(a+b)); f2-f*(b-(a+b));

Note: For non-welded nodes, the result is taken by the following rule: For Element 1: result for N1 = average result of N4 and N5. For Element 3: result for N3 = result for N6; result for N2 = result for N5.

To display force/moment define the direction in Plot group box and press Plot. The values will be displayed according to the selected method. The example of full weld part:

Weld_part_full

Note: Force and moments for the elemental method will show the absolute maximum value on the element from among its welded nodes.

- open Weld Finder Tool to recognize welds;

Press Clear all results to recalculate forces. All results in weld checks will be cleared automatically after confirmation

Tools_warning

- highlight selected weld parts;

- preview selected weld parts;

- display colored weld plot with weld ids as labels;

- detailed information about single weld part, including results for each element/node.

Weld_part_info"

- display forces as labels for selected weld parts;

- display moments as labels for selected weld parts;

Note: Forces and moments labels for the elemental method will display the values from all the welded nodes of the element.

- draw coordinate systems based on selected Method. Per full weld, the method uses information from the Weld Finder Tool. Per element, the method calculates a coordinate system at each node. Averaged vectors from the neighbor elements are used:

Weld Stresses

Stresses due to forces are calculated using the weld area, and due to moments using the inertia of the full weld.

Note: Forces are retrieved from the Weld Summation tool and calculations are based on the selected method: per full weld (averaged on weld part) or per elements (abs max result over element corners).

Note: Weld inertia is calculated assuming that an effective weld section is horizontal and the weld is double-symmetric.

Weldsummation_formula

Weldsummation_formula

Stresses are rotated into weld X, Y, and XY directions and translated to points on the weld face at each end of the weld (T1, T2, B1 and B2).

Weldsummation_throat

Following matrix of rotation is used:

Weldsummation_matrix

- Von Mises stress at a certain point. Stress is used in calculations of weld capacity in design standards;