Postdoctoral Appointee - Granular Rock Salt Mechanics

Sandia National Laboratories

Albuquerque, NM

Job posting number: #7087432 (Ref:679027)

Posted: October 20, 2021

Job Description

This postdoctoral position is a temporary position for up to one year, which may be renewed at Sandia's discretion up to five additional years. The PhD must have been conferred within five years prior to employment. Individuals in postdoctoral positions may bid on regular Sandia positions as internal candidates, and in some cases may be converted to regular career positions during their term if warranted by ongoing operational needs, continuing availability of funds, and satisfactory job performance. Employees must remain in their current position for one year before applying for a new position, with the exception of student interns. Application of this requirement will not supersede collective bargaining agreements. See collective bargaining labor agreements for represented bidder eligibility requirements for represented employees. : This posting will be open for application submissions for a minimum of seven (7) calendar days, including the ‘posting date’. Sandia reserves the right to extend the posting date at any time. : Sandia demonstrates its commitment to public safety in the national interest by requiring that all new hires attest to their vaccination status before commencing employment. The requirement also applies to those who are telecommuting and working virtually. Any concerns about the ability to meet this requirement should be directed to HR Solutions at (505) 284-4700. : The Materials and Failure Modeling Department is looking for a highly motivated and productive individual to study the consolidation of granular rock salt! During the consolidation process, rock salt grains can rearrange, viscoplastically deform, form micro and macro-fractures under low confining pressures, and heal under high confining pressures. One potential project involves large-scale simulations of rock salt tunnel collapse, rubble pile formation, gradual tunnel closure due to rock salt creep, and rubble pile reconsolidation. Another potential project involves constitutive modeling of granular salt (< 1 cm grain size) reconsolidation back into intact salt under compressive stress states. Other projects that align with mission goals and the individual’s interests may be possible. In this role, the individual may have the opportunity to: + Work closely with both internal and external experimentalists. + Partner with code development teams to drive robust predictive capabilities. + Utilize traditional and advanced numerical methods on world-class computing hardware. + Work across the entire research-development-application domain. + Attend conferences and publish research findings in peer-reviewed journals. Join our team and achieve your goals while making a difference!

+ PhD in Civil Engineering, Mechanical Engineering, Applied Mechanics, Aerospace Engineering, or a related field + R&D experience with materials that exhibit nonlinear, dissipative, mechanical behavior + Experience in numerical methods commonly used in solid mechanics + Experience programming with one or more languages, such as Python or C++. + Excellent written and oral communication skills, as evidenced by conference presentations and journal publications

+ Experience researching granular mechanics, pressure solution redeposition, dislocation-based viscoplasticity, continuum damage mechanics, and/or failure modeling + Experience performing large-scale numerical simulations of structures and mining the results for various quantities of interest. + Experience with meshless (meshfree) methods, such as Material Point Method or Reproducing Kernel Particle Method + Experience developing macro-scale material models based on phenomenological measurements, microstructural observations, micro-physical models, and the laws of thermodynamics + Experience constructing robust numerical implementations of material models and verifying them against reference solutions + Knowledge of experimental techniques for material characterization + Experience calibrating and validating material models against experimental measurements

Department Description:

The Materials and Failure Modeling Department 1558 performs mechanics of materials R&D, develops advanced engineering constitutive models, and deploys state-of-the-art computational capabilities to enable credible mechanical and failure predictions. The department’s focus areas include material models for behaviors ranging from aging to shock physics, effective model calibration methodologies, and quantification of uncertainty associated with material models.

About Sandia:

Sandia National Laboratories is the nation’s premier science and engineering lab for national security and technology innovation, with teams of specialists focused on cutting-edge work in a broad array of areas. Some of the main reasons we love our jobs: + Challenging work with amazing impact that contributes to security, peace, and freedom worldwide + Extraordinary co-workers + Some of the best tools, equipment, and research facilities in the world + Career advancement and enrichment opportunities + Flexible work arrangements for many positions include; 9/80 (work 80 hours every two weeks with every other Friday off) and 4/10 (work 4 ten-hour days each week) compressed workweeks, part-time work and telecommuting (a mix of onsite work and working from home) + Generous vacations, strong medical and other benefits, competitive 401k, learning opportunities, relocation assistance and amenities aimed at creating a solid work/life balance* World-changing technologies. Life-changing careers. Learn more about Sandia at: *These benefits vary by job classification.

Security Clearance:

This position does not currently require a Department of Energy (DOE) security clearance. Sandia will conduct a pre-employment drug test and background review that includes checks of personal references, credit, law enforcement records, and employment/education verifications. Furthermore, employees in New Mexico need to pass a U.S. Air Force background screen for access to Kirtland Air Force Base. Substance abuse or illegal drug use, falsification of information, criminal activity, serious misconduct or other indicators of untrustworthiness can cause access to be denied or terminated, resulting in the inability to perform the duties assigned and subsequent termination of employment. If hired without a clearance and it subsequently becomes necessary to obtain and maintain one for the position, or you bid on positions that require a clearance, a pre-processing background review may be conducted prior to a required federal background investigation. Applicants for a DOE security clearance need to be U.S. citizens. If you hold more than one citizenship (i.e., of the U.S. and another country), your ability to obtain a security clearance may be impacted. Members of the workforce (MOWs) hired at Sandia who require uncleared access for greater than 179 days during their employment, are required to go through the Uncleared Personal Identity Verification (UPIV) process. Access includes physical and/or cyber (logical) access, as well as remote access to any NNSA information technology (IT) systems. UPIV requirements are not applicable to individuals who require a DOE personnel security clearance for the performance of their SNL employment or to foreign nationals. The UPIV process will include the completion of a USAccess Enrollment, SF-85 (Questionnaire for Non-Sensitive Positions) and OF-306 (Declaration of for Federal Employment). An unfavorable UPIV determination will result in immediate retrieval of the SNL issued badge, removal of cyber (logical) access and/or removal from SNL subcontract. All MOWs may appeal the unfavorable UPIV determination to DOE/NNSA immediately. If the appeal is unsuccessful, the MOW may try to go through the UPIV process one year after the decision date.

EEO Statement:

All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, or veteran status and any other protected class under state or federal law.

All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or veteran status.

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