| ISOGRID-ISOGRID-SST™™ is a super-rapid, thorough, easy-to-use and economical software
system for the design, analysis, optimization, tooling/planning, manufacture and
maintenance of shell structures. The above Figure profiles the organization and functions
of ISOGRID-SST™. ISOGRID-SST™ code is uniquely designed for growth, maintenance and interfacing with other
CAD/CAM/CAE systems. ISOGRID-SST™ provides, for the first time, essentially off the shelf
integrated, end-to-end ,computer aided tools capable of accommodating a large number of
shell structural types, configurations and construction materials usable, for a wide range
of applications, with minimal expenditure of cost and time.
ISOGRID-SST™ also includes unique and automated analysis and methodology verification
techniques, called Super Traces. They bring full and immediate accountability to all
ISOGRID-SST™ produced results. Super Traces document step by step all analyses and provide specific
references for all analytical methods, equations, empirical data, test results and
assumptions used in the analyses.
PS Associates, Inc. has over 30 years of experience in structures design and
manufacture emphasizing CAD/CAM/CAE, with intense specialization in a limited class of
widely applied shell and plate structures. We have achieved many notable technical
advances because of this specialization coupled with our consistent and ongoing goals of
automating and perfecting our processes and procedures for design, analysis, optimization,
manufacturing planning and implementation.
Automatically generated ISOGRID-SST™ results and features include:
 | Optimized structural design definitions
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| Design layouts
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| 3D rendering
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| Super Traces which provide step by step
analysis details for verifying critical analyses both for numerical accuracy and correct
methodology implementation
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| Documented stress analysis including loads,
mass properties, etc.
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| Capabilities to handle isogrid, waffle,
skin-stringer and skin-frame structures which may include metallic, resin- and
metal-matrix composite materials
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| Structural synthesis, sizing, tailoring,
optimization and manufacturing related analyses using redundant, self checking classical,
empirical and finite element analysis methods
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| Inputs typically include external loads,
geometry, sizing criteria, locations and sizes of bosses, minimum gauges, manufacturing
tolerances, symmetry conditions, empirical knock down factors, analytical element sizes,
stiffness requirements, power spectral environment, material properties and initial crack
size
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| Margin summaries output for each analytical
element cover strength, general instability, local crippling, low and high cycle fatigue,
crack growth, diagonal tension and local and global modal analyses.
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| Physical models of isogrid and waffle
structures automatically generated from analytical models.
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| Pre-processors and post-processors
automatically verify and update internal loads.
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| Comprehensive automatically generated documentation describes all
inputs, outputs and algorithms including symbol definitions, references, analysis flows
and symbols used in major functional categories.
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ISOGRID-SST™ modeling and analysis modules and their functions and capabilities include:
OPTIMIZE sizes and tailors isogrid,
waffle, skin-frame, and skin-stringer structures
LOADS determines internal loads
FEM creates an FEM and then runs an FEA
FRAMES creates cross sections and
computes cross section properties
JOINTS analyzes shell rings
INTERFACE provides open architecture
MODELING optimizes integral shells
CYLINDER analyzes unskinned isogrid
SOLIDS creates solid models
TESTING predicts buckling loads
BOSS analyzes bosses and cutouts
FEATURES determines local internal loads
MFG provides flat patterns and
manufacturing planning
FORMING locates bending neutral planes
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