Download Free Advanced Composites Structural Concepts And Materials Technologies For Primary Aircraft Structures Structural Response And Failure Analysis Ispan Modules Users Manual Book in PDF and EPUB Free Download. You can read online Advanced Composites Structural Concepts And Materials Technologies For Primary Aircraft Structures Structural Response And Failure Analysis Ispan Modules Users Manual and write the review.

The ISPAN Program (Interactive Stiffened Panel Analysis) is an interactive design tool that is intended to provide a means of performing simple and self contained preliminary analysis of aircraft primary structures made of composite materials. The program combines a series of modules with the finite element code DIAL as its backbone. Four ISPAN Modules were developed and are documented. These include: (1) flat stiffened panel; (2) curved stiffened panel; (3) flat tubular panel; and (4) curved geodesic panel. Users are instructed to input geometric and material properties, load information and types of analysis (linear, bifurcation buckling, or post-buckling) interactively. The program utilizing this information will generate finite element mesh and perform analysis. The output in the form of summary tables of stress or margins of safety, contour plots of loads or stress, and deflected shape plots may be generalized and used to evaluate specific design. Hairr, John W. and Huang, Jui-Ten and Ingram, J. Edward and Shah, Bharat M. Unspecified Center NASA-CR-4449, NAS 1.26:4449, LG92ER0036 NAS1-18888; RTOP 510-02-13-01...
Non-linear analysis methods were adapted and incorporated in a finite element based DIAL code. These methods are necessary to evaluate the global response of a stiffened structure under combined in-plane and out-of-plane loading. These methods include the Arc Length method and target point analysis procedure. A new interface material model was implemented that can model elastic-plastic behavior of the bond adhesive. Direct application of this method is in skin/stiffener interface failure assessment. Addition of the AML (angle minus longitudinal or load) failure procedure and Hasin's failure criteria provides added capability in the failure predictions. Interactive Stiffened Panel Analysis modules were developed as interactive pre-and post-processors. Each module provides the means of performing self-initiated finite elements based analysis of primary structures such as a flat or curved stiffened panel; a corrugated flat sandwich panel; and a curved geodesic fuselage panel. This module brings finite element analysis into the design of composite structures without the requirement for the user to know much about the techniques and procedures needed to actually perform a finite element analysis from scratch. An interactive finite element code was developed to predict bolted joint strength considering material and geometrical non-linearity. The developed method conducts an ultimate strength failure analysis using a set of material degradation models. Dorris, William J. and Hairr, John W. and Huang, Jui-Tien and Ingram, J. Edward and Shah, Bharat M. Unspecified Center AIRCRAFT STRUCTURES; COMPOSITE STRUCTURES; CURVED PANELS; FAILURE ANALYSIS; FINITE ELEMENT METHOD; FUSELAGES; MODULES; STRUCTURAL DESIGN; TARGETS; ADHESIVES; BOLTED JOINTS; DEGRADATION; JOINTS (JUNCTIONS); NONLINEARITY...
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Individuals who complete the applicable modules aligned with this training document will be able to define the type of damage, define the extent of damage, determine if further inspection is required, evaluate the damage against published allowable damage limits, and provide accurate documentation of the damage. The intended outcome of the training is increased safety such that no aircraft is released with unknown damage and that the aircraft meets continued airworthiness requirements. The goal is to change the culture from damage discovery to damage reporting while also reducing or eliminating flight delays due to incorrect or insufficient information.Teaching levels have been assigned to the curriculum to define the knowledge, skills, and abilities graduates will need. Minimum hours of instruction have been provided to ensure adequate coverage of all subject matter including lecture and practical exercise. These minimums may be exceeded and may include an increase in the total number of training hours and/or increases in the teaching levels. The modules are intended to be a competency-based training approach.Each curriculum is a subpart of this document. Module 1 is the Composite Awareness curriculum, independent of the application. Module 2 is the Initial Inspection and Damage Mapping curriculum. Module 3 is the Special Inspection Tools curriculum. Module 4 is the Reporting, Recording, and Assessment curriculum.NOTE: While the modules in this document are technically interrelated, each module can be trained independently; modules may be selected as applicable to an operator's or maintenance organization's needs. The combination of the modules represents the applicable identification and assessment process for damage to composite aircraft structures (see Figure 1). Module 1 is prerequisite for attendance to the other modules. The contents of Module 1 may also be used for composite awareness training of a broader target audience, including line mechanics. With the increased use of composites in the construction of primary structure in commercial aircraft particularly of structure exposed to accidental damage during operation, there is a growing concern that damage may be improperly identified, inadequately assessed, or not reported.A risk exists due to: 1Many of the individuals working around composite aircraft may have little or no specific training or familiarity with composites and their differences from metals. This creates an opportunity for a common human factor "Lack of Knowledge" to affect their decisions and actions when reporting or investigating an aircraft damage event. 2Experience with previous aircraft may lead to human factors "Complacency" and "Norms" which may prevent individuals from taking the actions necessary to properly address composite structure. 3Individuals lacking proper training may not have the assertiveness to assess and report damage while operating under the stress, pressure, and fatigue common in the airline industry. 4Incomplete reporting of composite damage leads to more iterations and time in damage assessment process.All personnel working in the vicinity of a composite aircraft must be made aware of the importance of reporting all potential damage events to composite structure. Once the event is reported, it is the responsibility of the targeted audience to begin the assessment process, which will be covered in this curriculum.The use of composites in commercial aircraft requires proper training for identification, assessment, and reporting of accidental damage during operations.The damage assessment process on composite structure may require the use of special inspection tools defined as NDI equipment specified by the appropriate technical manual intended for use by non-NDT personnel. Training to operate these tools, the understanding of the composite structure configuration (e.g., surface, substructure, taper regions), and routine exposure to usage of the tools are key factors for effective damage assessment. The targeted audience includes line maintenance technicians, inspectors, certifying staff that can release the aircraft, and personnel evaluating the damage against Allowable Damage Limits (ADLs).