AFGROW Release 5.4 Overview

Features

• New/Enhanced Advanced Crack At Hole Solutions (combination of a corner crack and through crack at a hole)
• New Special Case Multi-Site Damage solutions
• New finite width correction for part-through cracks at a hole
• New single and double through crack at a hole weight function solutions
• Local material database in tabular-lookup format
• 35 new crack initiation material data sets
• Option to open Tabular Lookup material data file through COM
• Modified output preferences: Add a check box to put output file in the same folder as input file. Allow the for each output file type to have the same name as an input file
• Option to use plugin from COM
• Better handling life in hours output. Output intervals printed in "hours" if the option to display life in hours is selected in the Output Intervals tab, the crack length plots are also converted to hours
• Print NASGRO material id in AFGROW output, save NASGRO model id in the AFGROW problem definition file
• Added Correction for a filled, unloaded hole for advanced models
• Added access to retardation metadata via Plug-in Interface
• Added prediction result information to AFGROW output XML file
• Implemented API 579 Stress Intensity Factor Solutions for Cylinders (22 new K models)
• Added CorLAS™ Burst Preassure Model
• Spectrum Manager is included in AFGROW installation

Combination of a Corner Crack and Through Crack at a Hole Solution

• Based on Börje Anderson SSHF2017 Database: Straight Shank Hole with crack originating at Faying Surface
• SSHF2017 Database contains only Corner Crack – Oblique Crack at Hole combination. The Corner Crack – Through Crack solution was generate by finding a limit value of K for the Oblique Crack, when its virtual A length goes to infinity
• Corner Crack – Through Crack solution can be used by itself or as a transition model from the Double Corner Cracks at Hole solution
• In the current AFGROW implementation, the solution parameters are valid for the limits shown below:
  • 0.333 ≤ R/T ≤ 2
  • 0.0 ≤ A1/T ≤ 0.95
  • 0.1 ≤ A1/C1 ≤ 10
  • 0.01 ≤ C1/C2 ≤ 6.0
• The R/T limits will be expanded in future releases

New Special Case Multi-Site Damage solutions (MSD)

Single and Double Through Crack at a Hole Weight Function Solutions

Based on Jihwi Kim, Michael R. Hill (Department of Mechanical and Aerospace Engineering, University of California) paper: “Weight functions for a finite width plate with single or double radial cracks at a circular hole” that was published in Engineering Fracture Mechanics and also presented at AFGROW Workshop 2016

Single Edge Corner Crack Weight Function Solution

Based on Glinka, G., PhD, DSc., “Quarter-elliptical corner crack in a finite thickness plate – in plane stress distribution” delivered to LexTech, Inc. as part of the contract with SAFFD, Inc., Mannheim, Ontario, Canada

Can be used to model the single edge corner crack or single corner crack at hole

Local Material Database in the Tabular Lookup Format

• Based on AFMAT Raw Data
• Searchable by material name and type
• Database can not be modified
• AFGROW can be configured to be used the database on local computer, network server or company intranet
• There are currently tabular curve fits for 85 materials in the local database

New Crack Initiation Material Parameter Data

Open Tabular Lookup Material Data File Using COM

Enhanced Output Preferences

• Added a check box to save output files in the same folder as the input file
• Allow all output file types to have the same name as the input file

New Life in Hours Output Options

Crack length vs. Cycles plots displayed in hours when using the Predict, Preference option to Display Lifetime in Hours

Output increments are provided in hours accordingly

NASGRO Material Model Changes

• Improved data selection
• Material code is displayed in the output
• Material code is saved in the AFGROW problem definition file

Prediction Result Information in AFGROW Output XML file

API 579 Stress Intensity Factor Solutions

ID	Name	Load	Stress Distribution	Classic Model Equivalent
5010	Longitudinal Through Crack In Cylinder (9B.5.1)	Pressure		2098
5030	Circumferential Through Crack In Cylinder (9B.5.3)	Pressure		2090
5040	Infinite Longitudinal Surface Crack In Cylinder (Internal) (9B.5.4)	Stress	Polynomial
5041	Infinite Longitudinal Surface Crack In Cylinder (External) (9B.5.4)	Stress	Polynomial
5060	Infinite Longitudinal Surface Crack In Cylinder (Internal) (9B.5.6)	Stress	WF
5061	Infinite Longitudinal Surface Crack In Cylinder (External) (9B.5.6)	Stress	WF
5070	Circumferential Crack In Cylinder (Internal) (9B.5.7)	Pressure		2096
5071	Circumferential Crack In Cylinder (External) (9B.5.7)	Pressure		2095
5090	Circumferential Crack In Cylinder (Internal) (9B.5.9)	Stress	WF
5091	Circumferential Crack In Cylinder (External) (9B.5.9)	Stress	WF
5100	Longitudinal Surface Crack In Cylinder (Internal) (9B.5.10)	Pressure		1091
5101	Longitudinal Surface Crack In Cylinder (External) (9B.5.10)	Pressure		1092
5110	Longitudinal Surface Crack In Cylinder (Internal) (9B.5.11)	Stress	Polynomial
5111	Longitudinal Surface Crack In Cylinder (External) (9B.5.11)	Stress	Polynomial
5120	Longitudinal Surface Crack In Cylinder (Internal) (9B.5.12)	Stress	WF	3030
5121	Longitudinal Surface Crack In Cylinder (External) (9B.5.12)	Stress	WF	3040
5130	Circumferential Surface Crack In Cylinder (Internal) (9B.5.13)	Pressure
5131	Circumferential Surface Crack In Cylinder (External) (9B.5.13)	Pressure		1090
5140	Circumferential Surface Crack In Cylinder (Internal) (9B.5.14)	Stress	Polynomial
5141	Circumferential Surface Crack In Cylinder (External) (9B.5.14)	Stress	Polynomial
5180	Longitudinal Full-Elliptic Embedded Crack in Cylinder (9B.5.18)	Stress	Polynomial
5190	Full-Elliptic Embedded Crack in Cylinder (9B.5.19)		Polynomial