Mechanical - Structural Analyst

LLNL•Livermore, CA

11d•Hybrid

About The Position

Join us and make YOUR mark on the World! Lawrence Livermore National Laboratory (LLNL) has turned bold ideas into world-changing impact advancing science and technology to strengthen U.S. security and promote global stability. Our mission spans four critical national security areas nuclear deterrence, threat preparedness, energy security, and multi-domain defense empowering teams to take on the toughest challenges of today and tomorrow. With a culture built on innovation and operational excellence, LLNL is a place where your expertise can make a real impact. We have multiple openings for Mechanical/Structural Engineering Analysts with a strong background in solid mechanics and finite element analysis (FEA) to support Lawrence Livermore National Laboratory (LLNL) stockpile programs. In this role, you will perform computational modeling and simulation using advanced, nonlinear finite element analysis codes developed at LLNL to evaluate structural and material responses to combined thermal, quasi-static or dynamic, and hydrodynamic loads under time-dependent kinematic conditions. You will contribute to research and development in advanced simulation capabilities, including constitutive modeling, Simulation Process and Data Management (SPDM), as well as Verification, Validation, and Uncertainty Quantification. Your work will support engineering design, testing, and certification of the nation’s nuclear weapon systems through both advanced development and practical design and assessment initiatives. These positions will be in the Weapon Analysis and Methods (WAM) section within the Computational Engineering Division (CED) of the Engineering Directorate. These positions will be filled at either level based on knowledge and related experience as assessed by the hiring team. Additional job responsibilities (outlined below) will be assigned if hired at the higher level.

Requirements

Ability to secure and maintain a U.S. DOE Q-level security clearance which requires U.S. citizenship.
Masters degree in mechanical, structural, or aerospace engineering, or structural/applied mechanics, or related field, or the equivalent combination of education and related experience.
Experience with commercial FEA tools (LS-DYNA, ABAQUS, ANSYS, ADINA or similar), or NNSA national laboratory codes (ParaDyn, Diablo, Sierra, or similar).
Fundamental knowledge of continuum mechanics (or advanced solid mechanics) and the finite element method.
Ability to work under general direction and use independent judgment to determine analysis methods and evaluation criteria while working independently or as part of a team within the assigned project group.
Proficient verbal and written communication skills necessary to effectively collaborate in a team environment and present and explain technical information.
Ability to travel occasionally.
Comprehensive knowledge in one or more technical areas: mechanical behavior of materials, structural mechanics, failure mechanics, dynamics, modal response, heat transfer, hydrodynamics, or thermo-mechanical response, and the ability to work independently as well as part of a team across multiple organizations at the Laboratory.
Experience in developing solutions to moderately complex technical challenges to enable forward progress, and comprehensive knowledge of elasticity, plasticity, failure, heat transfer, material science, engineering material performance, and properties of materials.
Effective communication and organizational skills necessary to perform duties and specific experience performing static structural, thermal, thermal-mechanical, dynamic, or hydrodynamic analysis through FEA.

Nice To Haves

Experience with finite element meshing software to develop high quality hexahedral based meshes that are sufficient for the selected analysis approach.
Programming experience, particularly in Python and/or MATLAB, and familiarity with Git version control environments.
Experience with commercial FEA codes such as Abaqus, Ansys, LS-Dyna, Nastran, CTH, or similar; or with NNSA national laboratory codes such as ParaDyn, Nike3D, Dyna3D, Diablo, Sierra, ALE3D, or similar.
Experience with the calibration and benchmarking of material models on empirical test data and working knowledge in experimental techniques and verification/validation practices.
Familiarity with FEA and Computational Mechanics Theory and practice, including nonlinear solid mechanics, heat transfer and material modeling.

Responsibilities

Contribute to the development of finite element analysis (FEA) models of mechanical components and contribute to the integration of the components into structural models at system level
Perform structural and/or thermal analyses using in-house codes for design, modification, optimization, testing, and certification of the nuclear weapon systems, in general technical guidance.
Document and present (as appropriate) simulation and analysis results and technical approaches.
Work with teams of analysts, code developers, engineers, and subject matter experts using established workflows, standards, and verification/validation best practices to solve technical problems under general direction.
Support deliverables with occasional travel as needed.
Perform other duties as assigned.
Develop finite element analysis (FEA) models of nuclear weapon systems, perform rigorous FEA of the systems, make engineering judgments on the system performances, and provide engineering resolutions to technical issues under limited direction.
Work independently and with teams using established workflows, standards, and verification/validation best practices to solve moderately complex technical problems under limited direction.
Participate in formal and informal design reviews as required.
Develop engineering analysis capability enhancements to achieve project deliverables, which may include contributing to FEA codes and pre-/post-processing systems.